[App_rpt-users] Very strange problem with DIAL + USB URIs.

Hi, I have a very strange problem with DIAL + USB URIs. I get choppy audio after a couple of days or maybe several hours of constant use. Restarting asterisk or even the PC wont solve the problem. The problem only goes away if I connect the URI to another USB or shut down the PC for several hours. Maybe some temperature problem on the USB card?? I'm using a standard PC (i5 + 8GB) with 2 USB URIs. To test the problem I connected a tone generator to the URIs. These are some examples of the saved audio files in asterisk: Normal After several hours after one day Some advice would be very appreciated Thanks in advance Best Regards John