after two weeks of vacation and then getting super exhausted by work at the beginning of the week, I could finally stream again and of course with some technical difficulties. So my mixer died two times while streaming. I couldn't really figure out why but the last time I had technical difficulties, where my whole stream died, was because of weird obs stuff, so maybe this is similar. I also tried to reproduce it but it didn't happen again. So for the moment, I will just ignore it and hope it doesn't happen next stream. Maybe it was just a loose cable... I don't really know.
... but it was also weird that while my mixer died and my mic cut off, my emulator was also lagging... so maybe it really is obs or windows, would be weird if mixer issues had influence on an emulator.