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is there any reason do you know it can be
Seems to be a common trend. Lots of pages (including sections of DMOZ) have suffered drops in PR over the last few months.
I have seen drops in PR for a couple of the sites I manage. Hasn't made any difference to traffic levels though (if it had ... I'd worry).
Google crawls sites all the time right?
so say it hits a site that is negative for your site (and causes your points to drop).
Then it hit's positive site that link to yours, causing the rating to rise again.
Maybe the ratings are much more real-time than is commonly thought.
One thing for sure, you can never be sure :)