We have been having issues with two Timewave PSK-232's using the USB A to Mini B cable. One on packet 145.010 and one on APRS 144.390 using APRS + SA (KM7DES). They just loose communications with the computer. We then both on one computer for a while and then separated them and put them on individual computers. The problem remained for the last few months..
I had the same issue with my Davis Vue weather station using the same cable. Resolution was to put a 5mm ferrite cylinder near the console of the Weather Station. It has been running for over a month with no issues.
I bought some extra ferrite cylinders so I put one on each of the Timeware PSK-232 at the TNC side of the cables at the State DES. They have been running for over two weeks with no issues. I will watch it to make sure this does resolve the issue.
If it all works out well, I will switch the software over the APRSIS32 at KM7DES.
Just thought you would like to know.