I've been trying to get Logitech support to help me resolve spontaneous track skipping, stopping, and constant interruptions in the server connection to no avail. It happens with both the duet and the classic, in wired or wireless modes (I did the factory reset and confirmed that it was in wired mode). The first suggestion was to follow the guide for ESET NOD32 users...everything the guide said to do was already done. It's probably some weird firewall thing that updated itself. Who knows, but it's really irritating.
So, while waiting for the next suggestion from Logitech I loaded foobar2000 for the first time and connected a USB cable to my Benchmark DAC1. Good stuff, this Foobar2000. If I didn't want to connect more than one system wirelessly with internet radio, I'd drop the squeezebox for sure.
Any suggestions for fixing this weirdness are welcome, but I feel better just venting.