Phone Keeps Restarting? How to Stop the Boot Loop
Your phone powers on, shows the Apple logo or manufacturer splash screen, and then suddenly restarts. It boots up briefly, maybe even reaches the home screen, and then reboots again. A phone stuck in a restart loop (also called a bootloop) is more than an annoyance — you cannot use it for anything. The good news is that restart loops usually come from a handful of identifiable causes, and most of them are fixable. Here is how we diagnose and repair them at Indiana Phones.
What causes a phone restart loop
The most common causes of restart loops we see at our Pacific Beach shop are a corrupted iOS or Android update (the phone tried to apply an update, something went wrong, and now it cannot fully start); a rogue app that crashes the system every time it tries to launch on startup; a failing or swollen battery that cannot maintain stable voltage during boot; water damage that is intermittently shorting critical components; and a failed storage chip that cannot reliably read the OS. Each of these has a different fix.
Force restart first, and keep trying
Before anything else, force restart the phone (see our force restart guides for exact button sequences by model). A force restart interrupts the loop and sometimes lets the phone boot normally if the cause was a transient software issue. Try it a few times. If the phone boots to the home screen and stays there for more than a few minutes, you are probably fine — back up your data immediately before the loop comes back.
Safe mode (Android)
Android phones have a Safe Mode that disables all third-party apps. If you can boot into Safe Mode and the phone stops restarting, you know a specific third-party app is the culprit. The exact procedure varies by manufacturer but typically involves holding the power button during shutdown and selecting Reboot to Safe Mode. iPhones do not have a built-in Safe Mode equivalent, but Recovery Mode Update (described below) serves a similar purpose.
Recovery Mode update or restore
For iPhones: connect to a computer running Finder or iTunes, force the phone into Recovery Mode, and choose Update when prompted. This reinstalls iOS without erasing your data and fixes most boot loops caused by corrupted updates. For Android: boot into recovery mode (typically volume up + power during boot) and choose ‘Apply update from ADB’ or reflash the firmware. Both approaches are riskier than a simple force restart but they fix many boot loops that force restart cannot.
Factory reset — last software option
If Update/Recovery does not work, factory reset erases everything and reinstalls the OS cleanly. On iPhones this is done through Recovery Mode Restore. On Android it is usually in Recovery Mode > Wipe Data/Factory Reset. You will lose everything not backed up, but you will almost always get a working phone back if the cause was software.
Battery swelling and random restarts
A degraded or swollen battery cannot deliver stable voltage during boot. As the phone draws current during startup, the voltage sags, the CPU browns out, and the phone reboots. This is surprisingly common in phones two or more years old. Check for physical signs of swelling (back glass lifting, screen bulging) and check battery health if you can reach Settings. Battery replacement fixes it.
When the issue is hardware repair
If software restore and battery replacement do not stop the loop, the cause is likely a logic board component. Common culprits are the power management IC (PMIC), the NAND storage chip, or damaged capacitors near the CPU. These require micro-soldering repair and a specialized repair shop. At Indiana Phones we evaluate these on a per-device basis and give you an honest recommendation about whether the repair is cost-effective for your specific phone. Call (619) 577-3065 or visit 1630 Grand Ave in Pacific Beach for a free diagnostic.
Related Reading
Related Services
- Phone Repair San Diego (all devices)
- iPad Repair San Diego
- Samsung Galaxy Repair
- MacBook Repair
- Phone Battery Replacement
Frequently Asked Questions
Why does my phone keep restarting by itself?
The most common causes are a corrupted OS update, a rogue app, a failing battery, water damage, or a failing storage chip. Start with a force restart and work through software fixes before assuming it is hardware.
Can a failing battery cause a phone to restart?
Yes, and it is more common than people realize. Degraded batteries cannot maintain stable voltage during the CPU current spikes that happen at boot. Replacing the battery often ends the restart loop entirely.
How do I stop my iPhone from bootlooping?
Try force restart first, then Recovery Mode Update via a computer (keeps your data), then Recovery Mode Restore (erases data). If none of those work, the issue is hardware and requires professional diagnosis.
Will factory reset fix a restart loop?
If the cause is software (bad update, rogue app, OS corruption), yes. If the cause is hardware (swollen battery, failed PMIC, water damage, NAND failure), no. Factory reset is usually worth trying if it is your last software option before hardware diagnosis.
