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Just moved my site to a new host
If the move was pretty smooth - and the new host is sound, then you should recover equally quickly; you may have missed a round of spidering. Few experience even a dip.
If the problem is prolonged, while I cannot say 'it's NOT the host change', history says that really is MOST unlikely.
I'd seriously suggest either a faulty setup with the new host/server - or an unfortunate coincidence.
If the move involved serious site rebuilding or navigation changes, that's a different story.
Either way, start from the premise "This Should Not Be Happening" - and look very carefully at any other possibility.
[added:] First thing to check for is that the new host has any necessary 301s in place, such as non-www to www. Check also any long forgotten redirects that may have been useful. Do check your navigation - xenu is your friend.
[edited by: Quadrille at 3:58 pm (utc) on Sep. 20, 2006]
When Google first rolled out their new infrastructure (Big Daddy) early this year, there were some major oddities in how toolbar PR was calculated. The scale they used was not comparable to the previous scale, and PR anomlies were all over the place -- internal pages with no inbound links that still were 2 or 3 PR points higher than the domain root. Crazy stuff.
Over the next few months the PR numbers jiggled around and settled out a bit, but we still hear about PR strangeness a lot.
If your traffic and your rankings on the search results are not affected, I say give this concern no more energy.