Apple’s latest watch update has effectively made useless many versions of their watch from SE to the latest generations, mine included. The issue includes lightning fast battery drain & overheating while charging. This is a outrageous & no word nor fixes provided. Mine will not charge without being off. Otherwise it either charges enough to stay at a low amount or just overheats. I have a Series 6 that used to last all day and now barely two hours of not even using it (just being on my arm). I have several other watches from them I am keeping offline to avoid this fiasco.
I can add my wife’s latest Series 9 was partially affected but appears fine for now, also I have read a lot of other user’s some of which have the Ultra who are affected. It doesn’t seem to be everybody but it sure is a lot of people and models. I do not want to test it on my other older watch models and mess those up (not all can be updated to this version but anyhow).