Haven't tried it yet but people online are saying wipe cache partition (Google how) and then run galaxy booster app

I have the same issue, around a third of my apps crash on open after the update

did you update the software yet? I had 2 updates maybe one of them messed up battery life

I've had the phone for a week now and the battery life is pretty bad, barely getting 4-5 hours SOT. I cant make it through a full day with basic use, clearly some software issues. My 2 year old Huawei Mate 20 pro has similar battery life.

I'm having a similar issue, max 4 hours screen time. did you use smart switch to transfer data to the S21U?