Does this only affect the alarm? Can you still play music normally through both the Boom and the Classic?

Is your Alarm set to play a playlist (dynamic or otherwise)?

The only slimproto errors I've ever had were early on in setting up the SB and wouldn't let me play any music at all. I believe in my case it was because SBS could not find the music. But again, this was when it was first being set up, not something that just happened from one day to the next without making any changes.