(I'm noting this separately from my other comment) I found that not using the ISP DNS on your router helps with this problem on several sites, this being one o

(I'm noting this separately from my other comment) I found that not using the ISP DNS on your router helps with this problem on several sites, this being one of them, among other benefits I recommend everyone use something like OpenDNS, Google's public DNS resolver (if you're comfortable with that) or CloudFlare via 1.1.1.1 (and associated addresses), or any other myriad of reputable third party DNS services