When an Android phone keeps restarting on its own, the hardest part is that nothing on screen tells you why. A reboot every few days is annoying; one every few hours makes the phone almost unusable. I have chased this exact problem on my own Pixel and on a friend’s Galaxy, and the reassuring pattern is the same both times: spontaneous reboots are almost always a software issue you can fix at home, not a dead motherboard.
I have ordered the fixes below from the fastest (a 10-second force restart) to the most involved (a factory reset). On my friend’s phone the culprit turned out to be a single weather widget, and Safe Mode exposed it in under an hour. Most people land on a fix within the first three steps.
Quick Answer
Force restart your Android by holding the Power button for 10 seconds, then install every pending app and OS update. If it still reboots, boot into Safe Mode (hold Power, long-press Power Off, tap Safe Mode). A phone that stays stable in Safe Mode means a third-party app is to blame, so uninstall recent apps one at a time.
What Is Actually Causing the Reboots?
Spontaneous reboots usually trace back to one of five root causes. When I match the symptom to the cause first, I skip straight to the fix that matters instead of working through all six blindly.
| Symptom | Most Likely Cause | Start With |
|---|---|---|
| Reboots right after installing an app | Incompatible or buggy app | Safe Mode |
| Reboots when the phone gets hot | Overheating | Cool down |
| Reboots during gaming or video | Overheating or low storage | Cool down, then storage |
| Reboots randomly all day | OS bug or corrupted system file | Force restart, then updates |
| Reboots only while charging | Faulty cable or battery | Force restart, then reset |
Pinning the symptom to a likely cause saves you from running every fix when only one applies.
How Do I Force Restart the Phone?
A force restart clears the phone’s memory without deleting any data. It takes 10 seconds and clears the one-time glitches that cause a sudden reboot. This is always the first thing I try because it costs nothing and often works.
Steps
- Hold the Power button (or Power + Volume Down on Samsung and some Pixel models) for 10 seconds until the screen goes dark and the phone vibrates.
- Release the buttons and let the device boot normally.
- Use the phone for 30 minutes. If no reboot occurs, the cause was a one-time glitch.
On Samsung Galaxy devices, Power + Volume Down forces a restart even when the screen is frozen and ignoring your taps — the trick that saved me when my friend’s Galaxy locked up mid-reboot.
A 10-second force restart costs nothing and fixes the most common one-off crashes.
Why Does My Phone Restart When It Gets Hot?
Android reboots itself when the processor hits a critical temperature, usually around 45 to 50 degrees Celsius. That is a protective shutdown, not a fault — but it confirms overheating is your trigger. The first time my Pixel did this, it was during a long navigation session in a hot car.
Steps
- Remove the case and set the phone on a flat, cool surface for 10 to 15 minutes.
- Close all apps and do not charge while it cools.
- Feel for heat concentrated in one spot (behind the camera or the center of the back). Localized heat can point to a hardware problem rather than normal load.
If reboots only strike during gaming or streaming, removing the case and not charging at the same time usually solves it. Reboots during plain calls or texting suggest something more serious worth a technician’s look. For prevention, my full guide on how to stop your Android phone from overheating covers the rogue apps and chargers behind most heat.
An overheating reboot is Android protecting itself, so let the phone cool fully before using it again.
How Do I Boot into Safe Mode to Find a Bad App?
Safe Mode starts Android with only built-in system apps running. If your phone stops rebooting in Safe Mode, a third-party app is the cause — and you can remove it without a full factory reset. This is the test that exposed the weather widget on my friend’s Galaxy.
Steps
- Hold the Power button until the power menu appears.
- Long-press Power Off (or Restart on some models) until a Safe Mode prompt appears.
- Tap OK to reboot into Safe Mode. The words “Safe Mode” show in the bottom-left corner.
- Use the phone normally for 30 to 60 minutes and watch for reboots.
- If it stays stable, reboot normally and uninstall the apps you added around the time the reboots began, one at a time, testing after each.
For the official walkthrough, see Google’s Android Safe Mode guide. If individual apps were already crashing before the reboots started, my guide on why your Android apps keep crashing handles that app-level diagnosis.
If the phone runs clean in Safe Mode, a recently installed app is your culprit.
How Much Free Storage Does Android Need?
Android needs roughly 500 MB to 1 GB of free internal storage to write temporary system files reliably. When that space runs out, the OS can crash the device mid-task. I have seen a phone at 200 MB free reboot several times a day until I cleared room.
Steps
- Open Settings > Storage and check the free space. If it is under 1 GB, keep going.
- Clear the cache for your biggest apps: Settings > Apps > [App Name] > Storage > Clear Cache.
- Back up photos and videos to Google Photos and delete the local copies — this recovers the most space the fastest.
For the full method, see my walkthrough on how to clear gigabytes of Android storage in under 10 minutes.
Keep at least 1 GB free so Android always has room for temporary system files.
Should I Install Every Pending Update?
Yes. Manufacturers ship patches that fix system instability and known reboot bugs, and running an outdated build is one of the most common reasons restarts drag on for weeks after other fixes. I always check for updates before considering a reset.
Steps
- Open Settings > System > Software Update. Samsung uses Settings > Software Update; Pixel uses Settings > System > System Update.
- Tap Check for Updates and install anything available.
- Update every app: open Google Play Store, tap your profile icon, then Manage Apps & Device > Update All.
- Restart the phone after the updates finish to apply them.
An up-to-date OS and app set removes the known bugs behind a surprising share of reboots.
When Is a Factory Reset the Right Call?
A factory reset wipes software corruption and returns Android to a clean state, resolving problems that survive every other fix. Treat it as a last resort and back up everything first, because it erases all local data, apps, and settings.
Steps
- Back up your data: Settings > Google > Backup > Back Up Now. Confirm photos are synced to Google Photos first.
- Go to Settings > System > Reset Options > Erase All Data (Factory Reset).
- Confirm and let it finish — usually 5 to 10 minutes.
- Set the phone up as new, restore only essential apps first, and watch for reboots over 24 hours before restoring the rest.
If the phone still reboots after a clean reset, the problem is hardware — a failing battery, damaged motherboard, or water intrusion — and a certified repair center is the right next step.
A factory reset clears any software corruption, so anything left afterward points to hardware.
Common Mistakes to Avoid
- Skipping the Safe Mode test. Many people jump straight to a factory reset when Safe Mode would have exposed one bad app in under an hour. Always test Safe Mode before wiping the device.
- Using the phone while it cools down. Running apps during an overheating episode keeps the temperature high and triggers more shutdowns. Set the phone aside completely for at least 10 minutes.
- Restoring every app at once after a reset. Adding everything back in bulk reintroduces the problem app without isolating it. Restore in small batches and monitor between each one.
- Wiping the system cache partition. Some older guides push this from recovery mode. On Android 10 and later it rarely fixes reboots and can introduce new OS errors, so skip it.
- Replacing the battery first. A failing battery does cause reboots, but mostly on phones three to four years old or with visible swelling. Exhaust the software fixes before paying for a replacement.
Frequently Asked Questions
Why does my Android restart only at night?
Scheduled app and OS updates usually install between midnight and 6 AM, and many trigger an automatic reboot to finish. On my own phone the nightly restart stopped once I set Play Store auto-updates to Wi-Fi-only and checked the System Update schedule.
Can malware cause an Android to keep restarting?
Yes, though it is uncommon. Malicious apps can destabilize Android and trigger reboots. When I suspect this, I boot into Safe Mode to isolate it, then run a scan with Google Play Protect from the Play Store menu and uninstall anything I do not recognize.
My phone reboots only while charging. Is the charger the problem?
Often, yes. A counterfeit or damaged cable delivers inconsistent voltage and can trip a protective shutdown. I once traced this to a cheap car charger; swapping in the certified manufacturer cable and adapter fixed it instantly. If it persists, the port may need cleaning or repair.
How long does an Android factory reset take?
The reset itself takes 5 to 10 minutes. Setup and restoring your backup adds another 15 to 30 minutes. When I reset my Pixel, the full round trip back to a usable phone was about 40 minutes with a large photo library.
Is it normal for an Android to restart once in a while?
One spontaneous reboot every few weeks is generally harmless, usually a minor system hiccup. I only start working through these fixes when a phone reboots more than once a week, which is the point where it stops being a fluke.
Conclusion
In most cases a force restart, a Safe Mode test, or freeing up storage is enough to stop an Android phone from rebooting on its own. Start with the force restart and work down only as far as you need — most people never reach a factory reset.
If battery life is suffering too, my guide on Android battery draining fast covers the next settings worth checking.