iOS 16

I upgraded my iPhone 11 to iOS 16 when it dropped and it has been functioning well until this evening when I was playing a game on my phone and it suddenly turned off and turned back on, it has done that like 5 times this evening alone and I’m very upset and angry. When it reboots it shows low battery then after a while the battery percentage goes back to normal and it’s really inconveniencing me. I don’t know what to do can anyone help? I’m this close 👌 to just throwing the phone away as a whole