Website ranking went from page one to not in top 50 overnight. Help/suggestions?

[Tosten]

One of our customer's websites initially ranked very well. For approximately 3 months it sat atop of Google for their optimized keywords. Suddenly, on November 17th, the ranking dropped and they were no longer in the top 50 for any keywords. We went through Google Webmaster tools and found no violations, so we emailed Google to see if we violated something and if they would reconsider. They responded "We reviewed your site and found no manual actions by the webspam team that might affect your site's ranking in Google." This is a site built on WordPress, so we turned off a majority of plugins in case one was somehow affecting the site.

They have an incredible amount of business partners that link their website from their partner's website menus, so they have about 15,000 links all with anchor text "insurance." (every page on partner site is seen as a different link). Think this is affecting it? Maybe Google sees it as artificial? (P.S. This has been set up this way for a while before they came on with us).

The site ranks on page one of Bing and Yahoo, but nowhere in top 50 for Google. Any suggestions?

Appreciate the help!

[EGOL]

Fifteen thousand links with "insurance" as the anchor text hit the homepage of this site.  Other than that, nobody is linkin' to it.

So, you might have a Penguin problem.  See article here...  http://www.mytrafficdropped.com/penguin/

[Brian-H]

Yep....that would be it...99.99% backlink profile 1 word and 1 other backlink that also contains the word insurance

If they are your client's business partners ask them to link to your site in a more natural way such as using the web address

[SoftzSolutions]

I think you have got an algorithmic penguin penalty and therefore, it will do no good if you continue sending them reconsideration request. My suggestion, download all the backlinks of your website, try to figure out which links appear unnatural and get them removed. It is time consuming but you have to remove them to revoke the penalty.

[Tosten]

Thank you for the responses. Thought that might have been the issue, but with your responses, I will move forward to try to get the links to appear more natural. Again, really appreciate everyone's input!