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Moving process wasn't smooth because the site showed an empty page for half the day but according to my logs Googlebot didn't visit the site during that time so I don't believe it was the problem.
I've seen -950 filtering before but this is different because I still rank #1 for the site name. The content itself should be ok, just a list of our products, contact details and Adsense.
I am prepared to wait but for how long? We're about to install an online store software but doing so to a filtered site isn't motivating. A new domain is possible but I'd rather keep the 4 year old one registered for our store name.
(By the way, a -950 penalty can still leave a site in #1 for its domain name.)
However I recently suggested my boss NOT to move a couple of sites to another hosting.
I think that Google has huge problems indexing some pages/sites and there are no common factors that make sense.
I wouldn't move one inch for now if I were you.
Of all G's reasons for filtering and penalizing this has to be one of the funniest ones.
b2net - You seem to be making all sorts of assumptions about what Google is doing. From the description of problems you had during your move, it sounds like you might want to check issues with your server and DNS.
Generally, moving sites between IPs or hosting companies is not a problem for Google, as their indexing is domain-name based.
Why was your site not showing for half a day? Has that problem been fixed correctly? If you'd kept your site up on both old and new servers while making the change... generally the way it's done... the move should have been seamless.
For future reference re moving sites, Matt Cutts covers the issue in his blog....
Moving to a new web host
I think your issue might be if the IP is shared with a bad site or it was formally used by a bad site.
"Bad sites" on the IP could do it.
Or, if it's an IP shared with other sites that provide the predominant link juice for your mini-site, that could cause the drop you observe. Google might see this arrangement as a closed network that's there to boost other members of the network. It's an arrangement that Google doesn't like.