I'm having the strangest issue of RME choosing randomly playback device for Firefox itself (not desktop nor DAW). Sometimes the port changes between different ADAT's and I have to check which one is active. But often the ADAT's do not match- so ADAT 5-6 plays back on 13-14, ADAT 1-2 plays back on 7-8 and so fourth- and this changes. The next hour playback simply stops and I have to search which chosen device playback this time is on (they work arbitrarily). This started happening yesterday and I've tried to update what I can. Sometimes only AES and Speakers work, but most of the time they don't.
I've had a perfectly working Fireface since 2018, so I am not at all conviinced it's an RME issue.
Could it be some Windows 10-issue?