Phone is on and off automatically

Can Force restart it: Hold down the Power button and Volume Down button simultaneously until the device restarts.

Check Battery Health

Update Software

Boot into Safe Mode: Press and hold the Power button, then tap and hold “Power off” until you see the Safe Mode prompt.

Check for App Issues: Clear Cache or uninstall recent apps

Factory Reset

Test with Another Charger or Battery: Use a different charger and cable to see if the issue persists.