Is anyone else seeing a large percentage drop for adsense revenue the past 7 days ?

Ive seen massive drops in revenue/clicks , traffic is still the same across all sites and the metric of the visitors locations are swaying more towards the more profitable countries like US, UK etc etc.

I have a hunch that its something to do with googles personalised searches, for example the other day i searched google for :

PST Repair tool for outlook express , Every since that time i have continuously seen the same advert across most sites i visit that have google adsense on advertising a PST repair tool and mail archiver.

Now if this is happening to more people it means that alot of people are seeing the same adverts every time they visit sites and will most likely only click it once and not the other thousand times they see it.

Is google now delivering ads based on what someones personalised search is rather than the relevancy of the content on the page ?

If it continues another couple of days i think i will be removing google adsense completely from all of our sites as its a significant drop in revenue, Anyone else experiencing the same thing ?

It was a short term thing, this thread is over 6 months old I think ill close it now