cwonr, this was happening with my station from time to time too. I had to reboot Samvibe or Kick the currently playing track to the next one (sometimes this helped), but I am in a different situation than you, I am a LIVE ONLY STATION w/SAM AS BACKUP.
I Was on Live365 back when they were free
as a founding broadcaster, but that was almost 20 years ago so it has nothing to do with Live365 or your username. Just an FYI, ever since I started using the WEB Based VIBE and stopped using the installed program running with SAM, I stopped having that issue..as well as a host of other issues (including multiple error messages all day long in the Health tab, etc.). I assume it is alot less taxing on my system memory having just SAM running, rather than SAM and Vibe running. Web-Based Vibe is a great change!