I had an install the beginning of last year where I had 5 AM200's. I had to return 2 of them for exhibiting similar issues.
Unlike your experience, Crestron wanted them back to investigate before saying anything so ended up having to purchase two more to get the job operational, however after having them for 2 days they were happy to refund them.
I think I may have been on the bleeding edge of a batch issue.
I have a 3200 sitting on my desk which I am about to evaluate, so far it looks ok.
