Hi folks, so for me 2 issues.
There was likely a RAM issue, even though I ran memtests. I updated from 2- 4 sticks a while ago and that caused some trouble unmasked after the update. But eventually I saw some more frequent crashes with the previous build too. After increasing voltages things have become much more stable and I could update the latest stable again.
On top of that my reverb g2 cable broke down, which I think contributed here as well. It could have been just a coincidence that always when I tried the latest stable built it would crash with those unplug errors. The headset eventually would not be detected anymore with some 4-1 error. They went away when I tried another headset.
So many crashes and hours later I think for my part I am good now. Thanks for your input!