Forget about the Google Dance or the Sandbox, I'm experiencing Google HOUDINI!

[bimo]

Let me preface this by saying I have built a dozen or so sites and am extremely familiar with the Google Dance and Sandbox.

I've been pouring my life and soul into a coupon code site for the past 10 months and its doing something very strange. My site constantly ranks #1-#2 for my main keywords for about 3 days, and then completely disappears for about 3.5 weeks. Its done this about 6 times already since being launched and its extremely frustrating. Hence, the name Google Houdini, the site consistently performs a disappearing act.

Any ideas why this is happening? Any ideas on how to stabilize the rankings?

The site has been gaining popularity in the niche and has been featured on many design websites for its unique design. It has dofollow links from AboutUs.org, and I am considering paying for a site review for the Yahoo directory, Business.com directory, BOTW, and JoeAnt.

Any help is greatly appreciated!