USB connected audio sound breaking up. Headphone jack works fine.

I have a late 2015 27" Retina 5K iMac running Monterey. I have been using these external DACs and amps for a couple of years without any issues. I was wondering if the move to Monterey may have something to do with this. I did try a NVRAM reset but not sure it did anything. Thanks.

I have switched different DACs and Amps and this does not fix the problem.

Any ideas?