Google and other websites sporatically getting blocked

Every now and again sites like www.google.com get blocked.  I can still command line ping the site, but any of the big 3 browsers can't reach it.  Gateway error.  Norton and Malware Bytes don't see anything.  An occassional tracking cookie.  But once this error starts happening it keeps happening, sometimes even after a reboot.  I just dropped the norton firewall and google loaded so fast it made my head spin.  Can anyone direct me to where I should be looking in the firewall settings?  I've not seen anything about the google website yet.

 

Thank you.