USB B MIDI receive stops when USB over audio In is chosen [UPDATE FROM USER REQUIRED]

As the title says. Sometimes it stops after a while, sometimes immediately and a reboot of the S2400 is required. USB Din works fine.

Could you elaborate? Or maybe shoot a video showing the problem?

Also, is this on the 2021-12-24 Update?

I did update to the latest firmware and the behaviour was much better, however, after ~ 20 min or so the 2400 stopped responding again to MIDI input via USB. I’m sending a lot of notes, 64triplets etc.
I’ll experiment if this still happens when the 2400 is not chosen as an audio input in the driver settings.