I don’t think you’ve said what firmware you’re on, or at least, I can’t find it mentioned in the discussion here easily, so… what is that? Found it! 7.32 beta 4 now, right?
I’ll refer you to this thread, also: Suggestions for freeing up space
I would also look at the contents of /etc/cmh/alerts and see if there is a ton of files hanging around in there.