Are you running pihole or any other add blocker? I’m not seeing what I would expect in your dig, buy it is worth asking because I was seeing the same inability to resolve plex.tv in my logs, along with some oddly inconsistent issues with Plex, and eventually found the issue was that I had “Enable DNSSEC” enabled in my pihole instances.
This is something I really want turned on, but plex.tv has a problem with DNSSEC per this thread. I’ve even considered a pihole instance specifically dedicated for my Plex Server instance DNS resolution. The fundamental issue is that .tv is actually the internet county code top level domain for the country of Tuvalu, and according to GoDaddy DNSSEC can’t be used for .tv domains.
