The failure is the rechargible battery. The battery will not charge, it is defective.
I hope there won't be any issues with the screen shutting off overheating. I'm so happy with it and it works very well no lashing or freezing like my other phone. Upgraded to android 13 and one ui without issues.
Everything works, phone looks brand new, but sim card is not working. I know forsure it is defective, or damaged. It decides to work for a few minutes and then sim not detected happens again.