iPhone 12 Pro Overheating and RAM management issues

iPhone 12 Pro 128gb bought at launch in 2020. Updated to IOS 15.3.1. Since last 2 updates phone have been overheating considerably to a point where it dimm the screen and cut perfomance to cool down. Another issues is RAM management and every app open to close and reload. It will happen within a couple of minutes after being opened. You can see the app drawer icons refreshing on main screen after a short while or they will crash while being used. That happens with ALL apps. Tried to reset all settings and attempt a full reset later today.

but all in all I am settled with leaving apple. The system quality have decreased dramatically in the past 2 years to a point that I have more issues than my previous Samsung phones.

one more issues. The camera sometimes doesn’t work. You open the camera and it’s all black, no other solution other than wait 1-2 minutes. It’s like the sensor takes time to wake up.