کرول نکرن googlebot به خاطر ارور فراوان DNS

با سلام.سایت من در چند روز گذشته با ارورهای DNS server زیادی روبرو شده به طوری که در اکانت googlewebmaster به من پیام داده شده که 138 ارور dns در سایت شما وجود دارد و googlebot دیگر سایت شما را کرول نمی کند.می خواستم بدونم چه مشکلی ایجاد شده که سایت به این صورت در اومده.من در یک ماه گذشته هیچ تغییراتی را در سایت اعمال نکردم.متن پیام گوکل به من به صورت زیر است:

[Only registered and activated users can see links. Click Here To Register...] Googlebot can't access your siteAugust 10, 2014
Over the last 24 hours, Googlebot encountered 134 errors while attempting to retrieve DNS information for your site. The overall error rate for DNS queries for your site is 99.3%.
You can see more details about these errors in Webmaster Tools.
Recommended action
If the site error rate is 100%:
Use a WHOIS tool to verify that [Only registered and activated users can see links. Click Here To Register...] has a proper whois record and that nameservers are configured for the site. If not, contact your domain registrar to update your whois records.
Using a DNS lookup tool, verify that the nameserver's name can be resolved to an IP address. If not, either update your whois record to contain an IP address for your nameserver, or update the DNS records for nameserver.
Using a DNS lookup tool, verify that [Only registered and activated users can see links. Click Here To Register...] can be resolved to an IP address. If it can't, update the DNS record for [Only registered and activated users can see links. Click Here To Register...] on your nameserver.
If the site error rate is less than 100%:
The most likely explanation is that your nameserver is overloaded. Contact your hosting provider and discuss the configuration of your DNS server and the possibility of allocating more resources to your DNS service.
If your site redirects to another hostname, another possible explanation is that a URL on your site is redirecting to a hostname that has a DNS problem. Consider checking the links to which your site redirects and make sure that the sites in your redirect links don't have any DNS issues.
After you think you've fixed the problem, use Fetch as Google to verify that Googlebot can properly access your site.

لطف کنید بررسی کنید.به چه علت این مشکل یک دفعه برای سایت من ایجاد شده.و رفعش کنیدزیرا سئو من به خاطر کرول نکردن googlebot به شدت پایین آمده.
با تشکر.