I'm having a laundry list of issues come up as well, though honestly I am so frustrated I can only remember a few.
While listening to music, if I shift to a game app, suddenly it jumps in sound. I am constantly prodding my volume up and down to keep it low while I work so that I can hear other things.
My recent apps disappear from the menu bar if I use it too often, and become and icon at the bottom. I hate that. I have had a note since the 3s and love the old sifting through it took only seconds.
Bixby is STILL always lurking! Last phone I was able to shut the whiny bleep up once and never have to worry about her again. Pleeease I just want her gone. I prefer Google weirdly enough.
I have the high contrast keyboard on so I can see what I'm doing because I'm old and crap. The damned thing has a notification I can't turn off in my drop down menu when it didnt use to. Why do I want to keep that up? I k now the dang thing is on!
I will say though that my battery seems to be working a whole lot better.