Hmm. For me, I get this randomly happening with FM (mostly) and IIRC, USB at times. The issue for me is the "Audience" or "Stage" setting of surround-sound or whatever. Switching it back to "Reference" always fixes the issues for me (i.e. just cycle through the 3 settings). Then, next time, it usually works again. I really like the way the "stage" setting sounds, compared to reference, so I always keep it on that when possible.
Seems like there's a race condition during startup somewhere that messes things up sometimes.. Still haven't figured out what triggers it.