I manage a <widget> site, totally dominated the sector for 2 years, solid business, sailed through every penguin and panda without any loss of position.
Site was literally #1 or 2 for any <widget> in this location and sometimes double and triple breakouts.
Now the site has lost a lot of rankings, can't see why it has been slapped at all and since the first week of October a different page has been displaying every day
Seriously, the most competitive pages that were at #1 thru #3 have all gone. Some had matching URL's, H1' a variation on H2, almost 2,000 words of highly relevant content about <various aspects of widgets>.
Pages were not keyword stuffed and they are daily replaced with pages that had irrelevant URL's, no matching H attributes and 30 words of irrelevant content.
Swings are massive daily: #3 to #105 next day to #12 next day to #84 and every day a different page for that same query.
I have never seen anything close to it.
In WMT; no crawl errors, no manual warnings, no html improvements, nothing!
Some of the less competitive terms are still hanging around top 6-10 (useless)
I went through the site and code but nothing, not a thing that I can see, I really cleaned the titles, which were great before but just to be sure I went through the site and submitted new sitemaps, still the same, last 11 days 11 different results page for 1 keyterm.
Anyone seen anything as fluid as this before?
[edited by: aakk9999 at 10:52 pm (utc) on Oct 20, 2013]
[edit reason] Exemplified niche and product [/edit]