I'm not sure if it is this or not but.... I removed alot of the links that were pointing to my coupon site from my other sites. They were sitewide links and all that, 8000 of them. The coupon site has gotten back into some good positions in Google's serps now after a long break. At this point I can only assume the links were causing it to fall... seen as spammy I guess (one more vote in favor of hub-spoke linking).
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