This happens all the time to me when I've got the whole player shuffled. I'm absolutely sure that there is some bunching going on. I had the whole player shuffled the other day and there was a series of about 20 tracks and all of them had been selected from about three albums. I've got just over 2500 tracks in all so it isn't like I've only got that number of albums on there. It was really freaking me out I can tell you. I reshuffled and everything was OK again (well back to the usual semi shuffled/semi bunched pseudo random shuffle). I haven't noticed it being any worse in the 2.0 betas than in 1.02/1.03. Except of course for the aforementioned 20 tracks.