The site is failing DNSSEC validation. Your ISP’s name servers might ignore that, but public name servers like Google and cloud flare won’t.
dnsviz.net/d/cheathappens.com/dnssec/
Yes, we are and have been aware of this. It's a flaw in the DNSSEC infrastructure. We switched DNS servers and disabled DNSSEC but it wasn't replicated to certain name servers. It's a Network Solutions problem and we have had open tickets with them since early this morning. The easiest fix for the end user is to use their ISP's DNS servers instead of Google or Cloudflare or Quad9 or OpenDNS, etc. until the issue is resolved. Either that or ping cheathappens.edgekey.net and add that address to your local HOSTS file as www.cheathappens.com.