Fireface 802: Periodic audio artifacts

[Schroedingers-Cat]

I'm experiencing regular audio artifacts using the Fireface 802 connected via FireWire on Manjaro with kernel v5.13.

The artifacts occur about every 10-20 minutes for a duration of roughly one minute. The artifacts sound a lot like a constant phasing, suddenyl taking out a lot of low and mid frequencies and sounding harsh and but-crushing-like in the highs. The artifacts do not happen when dual-booting into Windows.

Not sure if this helps, but I think it could be related. When opening the Fireface 802 via Jack, I have to set the periods/buffer setting to 3 and the frames/period to 512 or 1024 to get only some xruns while doing simple desktop work (browsing, mails, music playback on a Ryzen 3950X, no realtime DAW stuff). Connecting the Fireface 802 via USB, I can set periods/buffer to default (which results in "2") and frames/period to 128 and still not get any xrun for hours when doing simple desktop stuff.