Oh, Ok
Mine dropped slightly at the end of last week, and I was about to post about it yesterday morning, when I noticed it had gone back up again. Then it went down in the evening!
Just for the record, as of this post, my count lists up as 512, so it's at least 12 short right now. I'm not too worried about the count, but since a post I made last night had vanished as well, I thought I should bring it to your attention ;-)