I am having trouble with channels 340 - 352 the pictures are fuzzy or breaking up like a bad connection or something.
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Is the problem present on all or only one TV (if more than one)? That will help figure it out.
Hit "MENU" on your remote. Then >Customer Support > Top Support Tools >Fix FIOS TV Issues - Follow the guidance
Anyhow, go back, remove and then retighten every connection between the ONT and the TV(s). Help?
If possible, try a direct connection between TV and and the ONT. Help?
There's more, but these are the simple ones
Does this happen on all TVs or just one?
If it is just one, then check the conections to that STB.
If it happens to all, then check connections from ONT to first splitter.