I had the same issue back in September (and I am also in Northern VA, but I believe that's a coincidence). The lower channels like 4 and 5 were unwatchable and it was working its way toward the higher number channels. We hadn't noticed that the lower channels were out because the HD channels (504, 505) seemed fine until they started having issues, too. I used the Verizon In-Home Agent, which after deciding there wasn't an easy fix (rebooting the ONT, STB, router etc), took me right to the on-line trouble ticking service. I had a new ONT two days later. The tech arrived, checked the signal and found the ONT to be bad. I got one of the refurbished units myself.
[Be nice! We are mostly fellow Verizon customers. My setup: 75/75 Mbps; Linux router (2x 1Gbps ports) + iptables; Netgear Orbi x 2
I dont believe any content provider does anything higher than 1080i.
I have ready some people recommend that you have stb run native and let the TV up scale as the TV has better processors.
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I can say replacing the ONT did resolve my issues with pixelation on channels. I tried different splitters and/or power splitters. VZ tech came out and said that both my ONT and power supply/with battery.
I've just started having this problem ... coincident with the new on demand UI... The only channels that pixelate are on demand ... trying to watch anything. I have 5 TVs with 4 STBs. I've had Fios (this time around) for 4 years and have never had a problem until now. Callesd tech support and got the "usual" simplistic set of solutions. I've checked every connection, installed new (low loss, 2.4GHz) spitters, reset all STB, reset wireless router, reset main panel. I don't have Quantum boxes, but since OD was working fine two weeks ago, I don't believe this is a problem within my house. Live TV is fine as well as watching from DVR. I even connected only one TV to the same splitter that feeds the wireless router (-3.5dB loss) so it and the router were the only two devices connected ... didn't correct the problem. Not sure where to turn at this point, but this problem makes any OD show non-watchable.