Every so often I get pop-ups on iTunes (mac) that my iCloud session has expired and I have to re-enter my password. I've deleted all of my music off the computer and only stream from Match. Problem is, when I re-enter the password and log back in, the music is still grayed-out / unavailable, and the only way to make it accessible again is to quit iTunes and start it again. It's very annoying. Anyone know how to stop it from automatically logging me out?