Wonder if you can help, had an issue with speed on my old server which was running on Windows, just changed to a new Linux server, with a new ip, Looks like the DNS has resolved and propagated well and the site is running fast, which is good news and why i change initially

I lost a few of my rankings which recovered within 12 hours, not sure if that was a coincidence

But although only 14 hours since the move, Googlebot, Yahoo and Bing cannot get past the index page and keep visiting index, Google has been there over 1000 times, i have has another bot PSinet visit other pages

is this normal, i have checked Robots to make sure nothing is blocked, but a little concerned now, is this normal behaviour after a server change

Thanks in advance