Hi there,
I have been using a UFX for years in the same setup.
Currently running MacBook air, 15inch , M2, 2023 as studio computer
MAC OS Ventura 13.6.6

UFX - Driver v3.31, Firmware v361

Logic pro v10.8.1 Rosetta

Without changing anything in my studio setup, I noticed my UFX was suddenly switched to 32K sample rate.
I changed back to my usual 44.1k. I was playing a clip from YouTube. The meters in Total Mix are all showing normal with software playback to Output 1-2, but there is no audible audio.

I then opened logic and the same problem.

After re-installing drivers and firmware, it worked on my default snapshot. However when I switched to a different snapshot on Total mix, there was a loud high pitched click and all audio disappeared again. Switching between snapshots creates the same high pitched click but no audio is present.
Intermittently, the default snapshot will work normally but is also prone to cutting out.

When I use logic, it is fine for a little while and then out of nowhere there is a loud click and then constant high distortion which sounds a lot like word clock losing synch.
If I toggle the sample rate on the Fireface settings page, it resets but the same problem occurs again  and again at shorter intervals.

I have experimented with all the different buffer sizes within logic and also the safety offset on the Fireface settings page.
I have also tried installing the new DriverKit 4.10 but was unable to open TotalMix after installing so reverted back to Driver v3.31.

I am totally stumped. If anyone has any ideas I would be most appreciative. I am unable to run my studio at present
cheers
Stu