Sudden drop and Rise in SERPs

[alexgray]

Our site was affected by panda but now we have recovered almost. But some strange things are going with our site for example

Traffic for some pages has been dropped(over 100 position) overnight and recover. (graph is attached for a page).

We have dropped(over 100 position) on all keywords for a page except a single keyword (staying on first or 2n position).

Our home page is not ranking in top 100 position for title keywords.

Is our website under any type of filter or penalized by Google?.

What is your opinion about our internal link structure and content?

URL http://bit.ly/rvxzDm and graph for this page is attached for sample data.

looking for your opinion and suggestions.

Thanks

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[alexgray]

I am very thank full to you all for your value able comments. We are going to redesign our website to make it more clean, focused and with the community development platforms like member area, blogs etc. We will also motivate the visitors to generate content that may not only help the other visitors but also increase the percentage of unique content on our site. We have also made some changes(in our current site) to decrease the duplicate content.  Again Thanks for your input.

[AlanMosley]

Matt Cutts has stated, take way advertising, content from other domains, duplicate content and look at what left, is it usefull and original?

Is this content found elsewhere on the internet?

If so you have thin content, you need to add more original content.

[RobertFisher]

Alex, 
It is difficult to know why you are getting the somewhat sawtooth pattern on the graph. Are you doing any type of online initiative that is driving traffic to the site during the up periods? Etc.

As to the site and specifically internal link structure, for the page you show, there are over 600 internal links when every suggestion I know of re internal linking is not to exceed 100. Yes, there are arguments that Google will crawl all, etc. but at some point, to me it makes it difficult on the engine to know what you are deeming to be relevant. I think things are just too cluttered here. With many who have sites like yours it becomes about how many ways can I move someone on the site, etc. Yes, you want them to use your coupons so there is a payoff, but I would try to do it in a way that was a bit cleaner and not with throwing the kitchen sink at them. (Note: this is intuitive for me as I have never managed a Coupon or Offer site).

I think you need to look at getting a little less shotgun in your approach and a little more rifle. If I am looking to shop at the firm you have on this page, keep me on that for that firm's items. Keep it simple, keep it clean.

[SuperlativB]

Is the whole site based on crawling and xml submission? i have seen a similar effect when alot of content was feeded in. the relevance drops since it looks like copied content can you twist of add content to your feed? That might help and try to get more unique content. There must be loads of cuponers that have cupons or know about cupons and would like too submit, exchange, or even trade cupons with others? Am I right?