iTunes keeps removing my favorited albums from favorites

This has been going on for months now. I go in and favorite an album, because I like to sort my albums by favorites since it's much easier to sort through. While a lot of them do remain in my favorites, every week or so some of those albums end up getting the "favorite" mark wiped off of it, so when I try to look for it and it isn't there. This is becoming increasingly annoying, and it seems like it's happening with specific albums too. Is anyone else experiencing this?