Nighthawk CAX80 Connectivity Issues with 2018 Samsung QN55Q6FNA TV Plus

Thanks for your input. Unfortunately, DMZ did not solve the problem.

I have a Sony 4K as well. Everything works fine on that and on the smaller Samsung. I am only seeing this problem on the larger Samsung. I wanted to test other apps on the larger Samsung and it seems all regular streaming services work fine (Netflix, Hulu, Amazon Video, and Disney+), the problems occur when I try to use Live TV type app like "TV Plus", "CBS News", "ESPN" etc. I'm not sure what could be blocking live signals to one TV but not the other 2.

Unfortunately, I am experiencing a new possibly unrelated problem as of today, perhaps a guru like you could answer.

I had Optimum's 400 plan and as of today I upgraded to Optimum's 1gig coax plan. They tried to send a guy here to upgrade my equipment even though I told them I have a CAX80 with DOCSIS3.1 capabilities and did not want their equipment. He arrived re-registered my CAX80, told me I'm good and left. I got a confirmation call an hour later to confirm if I'm 1 gig enabled or not. I tested my speed to find that I was still at 400mb down. I told them no, I don't have a gig and they told me to call customer service. I called them and escalated up to the "Network Engineer" who told me 1 gig coax will not work with anything but their own crappy Ubee Modem/Router combo. Essentially, they said either use their Ubee Modem/Router (and pay the $10/month fee to get 1 gig and return my CAX80 because it is "Useless" with that tier or downgrade back to 400mb to use the CAX80 as I was previously. This puts me at a crossroads, there must be away around the service block to allow the Optimum 1 gig service with my CAX80, no? Do I have to keep bugging them and escalating until some higher up enables it on my device? Thinking of the Frontier case or FCC's CFR 76.1201.

Also, I am stuck with Optimum for the time being as they are the only competitive speed internet in my area.