HI, this is not a fix, but since I installed IOS 16.2 on my iphone 12 a few days ago I have noticed when opening some apps they seem to lag a little before opening. I also noticed messages are no longer stored chronologically. If I delete a msg from a thread instead of it moving down to the date of the earlier message it stays at the top. I was on the phone today to apple support, he remote connected and asked to do certain things on my phone. He said my phone is fine and suggested the Basic troubleshooting steps suggested to you. I said I don't want to do that. He said it will be forwarded to the tech team as it's a software problem. I'm hoping it will be fixed in the next update