Was your site down during this period?
I would recommend setting up pingdom.com (free site monitoring), this will email you if your site goes down - I suspect this is a hosting related issue.
FYI, I can access your robots.txt fine from here.
Best posts made by SEOKeith
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RE: Oh no googlebot can not access my robots.txt fileposted in Technical SEO
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RE: Links from the same server has value or notposted in Technical SEO
Hi Uds,
I wouldn't say it's worth moving them... I suspect the links are all in the footers any way? (which pass less juice).
If you have 50 sites on one host from the same C block all linking back they are not going to pass as much juice as say 50 links from various high quality sites.
Keith