Android Phone Keeps Restarting? Here's Why and How to Stop It

Android phone keeps restarting fix

Random restarts are one of the most disruptive phone problems you can experience. You’re mid-call, mid-message, or using an app, and the phone just dies and restarts. Sometimes it happens once a week. Sometimes multiple times a day. Here’s how to diagnose and fix it.

Check for a System Update First

Random reboots are commonly caused by bugs in a specific Android or One UI version that manufacturers fix in subsequent updates. Go to Settings > Software Update and install any pending updates. If the problem started after a recent update, wait — a patch is usually released within a week or two for widely reported issues.

Test in Safe Mode to Isolate Third-Party Apps

Boot into Safe Mode by holding the Power button, then long-pressing Power Off until the Safe Mode prompt appears. Use the phone in Safe Mode for 24 hours. If the random restarts stop, a third-party app is definitely causing them. Restart normally and uninstall recently installed apps one at a time until the restarts stop.

Check Battery Health

A degraded or swollen battery is a common cause of random restarts. The phone shuts down when voltage from the battery drops momentarily below the threshold needed to run the processor — even if the percentage display looks fine. On Samsung, go to Settings > Device Care > Diagnostics > Battery Status. If health is poor, battery replacement typically resolves the issue.

Check for Overheating

When a phone’s processor reaches a critical temperature, the system forces a restart as a safety measure. If restarts correlate with heavy usage, gaming, charging, or being in direct sunlight, overheating is the cause. Try removing any case during charging and avoid using the phone for intensive tasks while on charge.

Inspect the SIM Card

A loose or damaged SIM card can cause random restarts as the phone repeatedly tries to re-establish the cellular connection. Power off the phone, remove the SIM card, inspect it for damage, clean the gold contacts gently with a dry cloth, and reseat it firmly. This fixes a surprising number of random restart issues.

Wipe Cache Partition

Boot into Recovery Mode (Volume Up + Power on most Samsung phones) and select Wipe Cache Partition. This clears the system cache without deleting personal data. Corrupted cache files can trigger system crashes that manifest as random reboots. This is a safe operation that often resolves unexplained instability.

Factory Reset as a Final Option

If random restarts persist through all other fixes, a factory reset is the definitive software solution. Back up your data to Google Drive first (Settings > Accounts and Backup > Back Up Data), then go to Settings > General Management > Reset > Factory Data Reset. If restarts continue after a clean factory reset, the issue is hardware and requires a repair center visit.