Phone Restarting Constantly
My phone keeps restarting. Its starts with a small black strip at the bottom of the screen then the screen freezes and turns off then the apple logo come up then the phone turns on again and repeats this process like three times. Then i can use the phone for like 5 minutes before it does it again. Will I have to take it to get repaired or is there something I can do at home to fix it.
iPhone 11 Pro Max, iOS 14