I have the same problem. Sometimes (for unclear reasons) OBS loses the audio from my external Motu M4. Power-cycling the M4 used to fix it, but now crashes OBS. Once OBS restarts, it does get the audio from the M4, but of course crashing and stopping the stream is not helpful.
I haven't yet had the first problem (losing audio input) in 32.1.0, so I haven't had to test the crashing on power cycle. I can do that on purpose, but am in the middle of a stream, so will try later if I remember.