Many months (maybe over a year) ago, I was also dealing with this issue. I spent some time iterating with @jonathon.hall to test various USB tuning parameters in the firmware, but I don’t think we ever fully resolved it, at least in my case.
This thread has some info:
In my case, I think I decided I should try to replace the capacitor, as mentioned in this particular post within that thread:
It’s a pretty low priority for me at this point, so I doubt I will get around to checking how things work with a different capacitor.