Just to add myself to the cause I got this last night having played 280 songs (isn't the rock band world app good) with no problem. It happened whilst trying to get the 70's goal with Ziggy Stardust and Night Fever. I did notice on one of them it was during a busy section and i think occured as i tried to skip over 2 lanes. Could it be to do with the amount of processing going into keeping it all live? It reminded me of similar glitches when smashing tons of stuff with lots of bolts in R+C: Crack in time.
Hopefully it can get a fix, for those it's happening repeatedly to