Sudden drop in rank and OSE index

[Joes_Ideas]

I had improved the rank of chairmats.net from page 3 to top of page 2 in Google over the course of a few weeks using on-page, content building, and "low-hanging fruit" link building.

All the sudden in the last 2 weeks, we have dropped to 22nd, have dropped out of the OSE index (chairmats.net doesn't show up, but some old links to www.chairmats.net show up), and PA is now 1. DA wasn't high before but also dropped a point.

I don't know why the sudden shun (I read about an exact keyword match for low quality websites update with Google recently, but this site has been around for awhile, and is a large supplier of chair mats.)

I'm working on getting quality links, it seems a little tougher for a supplier company like this.

Any suggestions on recovering?

[AdamThompson]

What date did your rankings drop?

[Joes_Ideas]

First week of October they took a dive. I hadn't made any major changes on-page in the last few weeks that I think could adversely affect it.

[AdamThompson]

Was it Oct 5 that your rankings dropped?

[Joes_Ideas]

I just noticed it down to 20 rank on Oct. 7th, and then it dropped a couple more spaces over the next week.

[AdamThompson]

You may have been hit by the Oct 5 Penguin update: http://www.seomoz.org/google-algorithm-change

Is it possible that you were hit by the 9/27 exact match domain update, but didn't notice the drop until 10/7?

It is also possible that the drop in rankings was not linked to a specific Google update.