My wife and I have S21 Ultras.
For months many of us have been experiencing a crash when we unlock our Samsung phones as we are connected to Android Auto. The Android Auto team told us a fix was on the way as they had worked with Samsung and a fix was going to be part of the July Security update.
That bug was acknowledged by someone from Samsung on the Google forums June 13. I got the update on the 18, Samsung could have halted it, but in their infinity stupidity they pushed a known bug on users. July update did not fix the issue either. As usual there are nothing but crickets from Samsung.
God forbid they issue an emergency patch, they rather let users suffer through their developers blunders.
Galaxy S21 Ultra 512g(VZW), Galaxy Book (original, VZW), Tab S4, Galaxy Watch3 (VZW)