There are two bands that I notice the empeg plays more than any others. Collective Soul and Verve Pipe.

Collective Soul used to be a lot bigger problem, but since 2.00b13, it seems to have become more random. For only having one Verve Pipe CD on the empeg, they do get an awful lot of play though. I usually only get 200 tracks into a "full suffle" playlist.

I would have to say you're on to something.