How to Fix an Android Phone That Keeps Restarting (2026): Stop the Reboot Loop for Good

By Auraz Tech Editorial Team | October 2026

You are mid-message, mid-call, or just holding the phone — and it goes black. The logo appears. It boots back up like nothing happened. Then it does it again. Random restarts are one of the most stressful phone problems because the phone is unusable in the most basic sense: you cannot trust it to stay on. The good news is that in the majority of cases, the cause is software — a bad app, critically low storage, a buggy update, or a heat-triggered protection reboot — and software causes are free to fix. This guide works from the fastest, easiest checks toward the deeper fixes, in the exact order a repair technician would try them. Follow them in order, and stop as soon as your restarts are gone.

Start Here: The Five-Second Checks

Before anything technical, rule out the physical stuff. First, check the power button — a button that sticks, or a case that presses on it, causes repeated reboots that look exactly like software trouble. Take the case off and press the button a few times; if it feels mushy, sticky, or stays slightly depressed, you may have found your culprit. Second, unplug and test off the charger — a faulty charger or cable that cannot deliver stable current can make the phone power-cycle during charging; if restarts only happen while plugged in, swap the charger and cable before you touch any software. Third, remove the memory card if you have one — a failing SD card can cause system processes to crash and trigger reboots; pop it out and use the phone for a while without it. If none of these apply, move on to the software hunt below.

Step 1: Boot Into Safe Mode to Catch the Bad App

The single most common cause of random restarts is a third-party app — one that runs in the background, crashes a system service, and forces the phone to reboot. Safe mode is Android's built-in lie detector for this: it starts the phone with only pre-installed apps and temporarily disables everything you downloaded. Nothing is deleted; it is purely diagnostic.

1. Press and hold the power button until the power menu appears.
2. Touch and hold Power off (or Restart on some brands) until a Reboot to safe mode prompt appears, then tap OK. The phone restarts with Safe mode written in the corner.
3. Use the phone normally for a few hours — or however long it usually takes for a restart to happen.

If the restarts stop in safe mode, a downloaded app is guilty. Restart normally to leave safe mode, then think about what you installed or updated recently. Free utility apps — cleaners, battery savers, phone boosters, screen recorders, and sketchy VPNs — are the most frequent offenders; our full safe mode guide walks through the uninstall detective work in detail. If the restarts continue in safe mode, a pre-installed system app or the system itself is at fault — skip to Step 4.

Step 2: Uninstall the Suspects (And Watch Your Timing)

You do not need to guess randomly. Check Settings > Apps and sort by recently used, then uninstall apps you added or updated around the time the restarts began — one at a time, testing between removals. Pay special attention to anything that runs constantly in the background: antivirus apps, RAM cleaners, battery optimizers, call recorders, and game booster overlays. Also clear the cache of the worst offenders first: go to Settings > Apps, tap the app, then Storage & cache > Clear cache. This fixes crashes caused by corrupted temporary data without removing your account or settings — only resort to uninstalling if the cache clear does not help.

One more spot to check: device admin apps. Some misbehaving apps grant themselves device-administrator privileges and resist normal removal. Look under Settings > Security > Device admin apps (path varies by brand), revoke anything you do not recognize, then uninstall it. Be ruthless about free utilities you do not actually use — a phone with fewer background apps restarts less, and there is a reason repair shops call cleaner apps job security.

Step 3: Free Up Storage — The Overlooked Cause

Android needs free working space to write temporary files, update system components, and keep background services running. When internal storage drops below roughly 10 percent free, the system starts misbehaving — freezing, crashing apps, and yes, rebooting itself. On a 64GB or 128GB phone that has been filling up for years, this is a genuinely common cause, and it is the fix people are happiest to discover because it is free.

1. Go to Settings > Storage and check how much is free. If you are under about 5–10GB on a phone with 64GB or more, treat this as your prime suspect.
2. Delete large, obvious space hogs first: downloaded movies and shows in streaming apps, old WhatsApp video forwards (the Sent folders are notorious), and duplicate downloads in the Downloads folder.
3. Move photos and videos to Google Photos backup (or your backup of choice), then use the Free up space option to remove the on-device copies.
4. Clear bloated app caches: Settings > Storage > Apps shows which apps are hoarding gigabytes of temporary data.

Our detailed guide to freeing up Android storage walks through every category with screenshots. After freeing at least 10–15GB, restart the phone once manually and watch for a day — many readers report the random reboots simply vanish at this point.

Step 4: Update the System and the Play Store

Random restarts that started after an Android update are usually a bug in that update — and the fix is usually the next update. Check Settings > System > System update (on Samsung: Settings > Software update) and install anything pending, even minor security patches, because they frequently carry stability fixes. Equally important, update your apps: an app written for an older Android version can crash system services on a newer one. Open the Play Store, tap your profile icon, go to Manage apps & device, and tap Update all. Also check the Google Play system update (Settings > Security > Google Play system update), which is separate from the main OS update and patches core system components independently.

If you suspect the current update is the problem and no newer one exists, hold tight rather than doing anything dramatic — rolling back Android requires flashing and risks your data. In the meantime, the cache-partition wipe in Step 7 often smooths out post-update instability. One thing worth doing right now: turn on automatic updates for both system and apps so you do not sit on a buggy version for weeks unknowingly.

Step 5: Stop the Heat-Triggered Reboots

Android has built-in thermal protection: when the internal temperature crosses a safety threshold, the phone shuts down or reboots to protect the battery and processor. If your restarts happen during gaming, 4K video recording, heavy camera use, or while charging in a hot room, overheating is likely the trigger, not the disease — but a phone that runs too hot will keep doing this until you cool its habits.

• Take thick or insulating cases off during heavy use, and never charge a phone inside a bag or under a pillow.
• Turn off background-heavy features you are not using: 5G, location set to High accuracy, and auto-sync for accounts you rarely open.
• Close resource-hungry apps before long sessions — a camera left recording in the background plus a game is a classic heat combo.
• Avoid direct sunlight on the phone, especially on car dashboards, and skip fast charging in very hot weather if your restarts cluster around charging.

See our full overheating guide for the deeper checklist. If the phone gets dangerously hot — too hot to hold comfortably — or the battery area is swelling even slightly, stop troubleshooting and take it to a repair shop; that is a hardware safety issue, not a settings problem.

Step 6: Check the Battery and Power Side

A failing battery mimics software chaos. Watch for the telltale pattern: restarts that happen at a specific battery percentage, the phone shutting off even though the meter shows charge remaining, or reboots only under load — camera, games, flashlight on. A battery older than two to three years degrades internally, and its voltage can sag under load far enough to brown out the phone, which the system reads as a shutdown and reboots from. Check Settings > Battery > Battery usage for sudden drop-offs that look like cliffs rather than slopes — those cliffs are the battery lying about its capacity.

Also test with a different charger and cable and, on phones with removable batteries or access to one, a different battery if you can borrow one. Phones that only restart while plugged in almost always have a charger, cable, or charging-port problem rather than an Android problem — try a certified charger from the brand if you can. If the battery shows any swelling — a screen lifting at the edges, a back panel that rocks on a flat table — stop using the phone and get the battery replaced immediately; a swollen battery is a fire risk and no software step matters until it is handled.

Step 7: Wipe the Cache Partition in Recovery Mode

When individual fixes have not landed, clearing Android's system-wide temporary files often does. The cache partition is where Android keeps temporary system data, and corrupted files there can cause exactly the kind of instability we are chasing. This is the one recovery-mode option that is genuinely safe: it deletes no apps, photos, accounts, or settings — only temporary files Android rebuilds itself. On newer Android versions some phones no longer show this option (Google has been phasing it out), but where it exists it is worth trying.

1. Turn the phone completely off.
2. Press and hold Power + Volume Up together (on some brands it is Power + Volume Down, or Power + Volume Up + Home). Release when the brand logo appears and the recovery menu shows.
3. Use the volume buttons to navigate to Wipe cache partition and press Power to select it. Confirm.
4. Select Reboot system now.

Be extremely careful here: the recovery menu also contains Wipe data / factory reset, usually one line above or below. Do not select it by accident — that one erases everything. The first boot after a cache wipe takes longer than usual; that is normal, the system is rebuilding its caches.

Step 8: Factory Reset — The Last Software Resort

If you have worked through every step above and the phone still restarts, a factory reset is the final software answer: it returns Android to a clean slate, eliminating any corrupted system configuration or deeply embedded misbehaving app. Back up everything first — our Android backup guide covers the full checklist — because this erases all apps, accounts, and local files.

1. Go to Settings > System > Reset options and tap Erase all data (factory reset).
2. Confirm, enter your PIN if asked, and let the phone complete the wipe and reboot.
3. Critical: during setup, do NOT restore your apps automatically. Set the phone up as new and test it for a day. If the restarts are gone, add your apps back in small batches — the restart will return the moment you reinstall the guilty app, and you will know exactly which one it was.

If the phone restarts even with a clean, app-free installation, you have proven the problem is hardware — no amount of further software work will fix it, and it is time for Step 9.

Step 9: Recognizing a Hardware Fault

Some restarts simply are not software. Take the phone to a repair shop — or use your warranty — when any of these are true: the phone will not stay on long enough to apply any fix in this guide; the restarts started right after a drop or water exposure; the battery is swollen or the phone gets painfully hot with light use; the power button is physically stuck or damaged; or you have genuinely tried safe mode, storage cleanup, updates, cache wipe, and a clean factory reset and the reboots persist. At that point the suspects are the power button assembly, the battery or its connector, or a fault on the motherboard — all of which need hands and tools, not settings menus. Bring the phone backed up and signed out of your accounts, and get a quote before authorizing any motherboard-level work, because on older phones the repair can cost more than the phone is worth.

Quick Recap: The Fix Order That Works

Random restarts feel chaotic, but the diagnosis is methodical: five-second physical checks, then safe mode to identify a bad app, then uninstalling suspects, then freeing storage, then updating everything, then cooling things down, then investigating the battery, then a safe cache wipe, then a factory reset, and finally a repair shop if software has been fully ruled out. Most people find their answer in the first four steps — the bad app and the full storage are responsible for the overwhelming majority of cases. Fix those, keep your system updated, and your phone can go back to the most boring, reliable behavior of all: simply staying on.

FAQ

Why does my Android phone keep restarting on its own?

The most common causes are a misbehaving third-party app, critically low internal storage, a buggy system update, an overheating battery, or a failing battery. Less common causes include a stuck power button and corrupted system files. Work through the software fixes first — in most cases the culprit is an app or a storage problem, both of which are free to fix.

Will booting into safe mode delete my data?

No. Safe mode changes nothing on your phone — it simply starts Android with only the pre-installed apps, temporarily disabling everything you downloaded. All your photos, messages and accounts stay exactly where they are. It is purely a diagnostic step: if the restarts stop in safe mode, a downloaded app is the cause.

Can low storage really make my phone restart?

Yes, and it is one of the most overlooked causes. Android needs free working space to write temporary files and update system components. When internal storage drops below roughly 10 percent free, the system becomes unstable and can reboot itself. Freeing up space — clearing app caches, deleting large downloads, moving photos to the cloud — often stops the restarts immediately.

Is it safe to wipe the cache partition in recovery mode?

Yes. Wiping the cache partition deletes only temporary system files that Android rebuilds automatically. Your apps, photos, accounts and settings are untouched. It is the one recovery-mode option that is genuinely safe — unlike factory reset, which erases everything. Just be careful to select wipe cache partition and not wipe data / factory reset, which sits right next to it.

How do I know if the problem is the battery rather than software?

Battery-related restarts usually follow a pattern: the phone reboots when it hits a particular percentage, shuts off even though the battery shows charge remaining, or only misbehaves under load like gaming or camera use. Swelling, rapid draining, or a battery older than two to three years also point to hardware. If you have exhausted every software fix in this guide and the restarts continue, the battery or power circuit is the next suspect.

When should I take a restarting phone to a repair shop?

Take it in when the phone will not stay on long enough to apply any fix, when restarts started right after a drop or water exposure, when the battery is swollen or the phone gets dangerously hot, when you have tried safe mode, storage cleanup, updates, cache wipe and factory reset and the reboots persist. At that point it is almost certainly a hardware fault — power button, battery connector, or motherboard.

Auraz Tech Editorial Team — we test every guide on real devices and keep our tutorials updated.