Googlebot Can't Access My Site
Over the last 24 hours, Googlebot encountered 20 errors while attempting to connect to my site. My site's overall connection failure rate is 32.8%. Here are the gtmetric results for my website speed : gtmetrix.com/reports/healthyfitnessdiets.com/yNxmZOab
The page load does exceed 3 seconds.( which might be causing the problem.)
I also contact the technical support and they told me Other sites on the same server are being scanned by googlebot wtih no errors. So google gave me this suggestions below but I couldn't undersnat what can be the reason.
Verify that the web service software for your site is installed and running properly.
Verify that your firewall or server are not blocking googlebot's access to your site.
Verify that all scripts that run on your site have proper permissions to run.
Verify that your site has proper permissions to access the pages of your site.
Using Webmaster Tools, find a day with a high error rate and examine the logs for your web server for that day. Look for errors in the logs for that day and fix the causes of those errors.
Your site may be overloaded. Talk with your hosting provider about either reconfiguring your web server or allocating more resources to your web server.
If your site redirects to another hostname, another possible explanation is that a URL on your site is redirecting to a hostname that has one or more of the problems listed above.