It looks like over the last 2 months Google has been "playing" with back links. They revalued a bunch, then devalued them over the next 2 weeks. They've done this a few times with different filters for different types of links. I'd imagine that they're testing the waters for Caffeine. In your situation, you fell to 220 but you're showing back up in Caffeine, sometimes. It would be wise for you to optimize your site a bit (nothing drastic) and try to get some more backlinks from higher pr sites.
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