That's Googlebot crawling your forum. You could block it by creating a .htaccess file or robots.txt file if you don't care about SEO or people finding your forum through Google.
Honestly though, vBulletin + shared hosting + HostGator is not a good combination from my experience. I highly recommend you to just get a cheap VPS (which is almost the same price as shared hosting these days), that way you have a lot more resources dedicated to your forum and this issue shouldn't happen.
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