Why do you keep unsubscribing me, LJ?

Is there a limit on the number of journals one can watch? I keep re-discovering communities that I know for sure I subscribed to at some point, but that mysteriously removed themselves from my watch list. Granted, I am currently watching 192 various communities and personal journals, so it's a lot for poor little LJ to keep track of for me, but to just drop me without warning is plain rude.