Samsung Galaxy S8 Keeps Restarting After Reaching the Lock Screen

You can also try clearing the system cache from the recovery menu, which normally doesn’t erase your personal files. Power the phone off, then hold Volume Up, Bixby, and Power until the recovery screen appears. Use the volume buttons to select “Wipe cache partition,” confirm with the Power button, and then choose “Reboot system now.” Be careful not to select a factory reset unless you’ve backed up anything important.

Since draining the battery hasn’t changed anything, this could be a failing battery, charging component, or other hardware issue rather than a simple software glitch. Check whether the phone is swollen, unusually hot, or physically damaged; if so, stop using it and don’t keep charging it. If Safe Mode and clearing the cache don’t work, a repair shop may be able to diagnose it more cheaply than replacing the phone. A factory reset is another software option, but it erases the phone’s data and may not fix hardware failure.

Try starting the S8 in Safe Mode. Turn it off, then power it on and hold the Volume Down button when the Samsung logo appears. If it stays on in Safe Mode, a recently installed app may be causing the restarts, so remove suspicious or recently added apps. If it still bootloops, the problem is probably not a normal third-party app.