Just an FYI that NBC has an annoying line bug in their HD signal, usually on the left side. It's seen on many local NBC stations. Not sure if this is what you are seeing. If so, nothing you can do about it.
If you switched format to 720p and then back to 1080i and they went away then I would just assume it was a display bug/corrupted data and wouldn't worry about it too much unless it happens on all channels. If it's just your local NBC then I'd go to the New York local HD thread on AVS and see if other users are seeing the same thing, especially OTA. That should help you track down the issue.
If you switched format to 720p and then back to 1080i and they went away then I would just assume it was a display bug/corrupted data and wouldn't worry about it too much unless it happens on all channels. If it's just your local NBC then I'd go to the New York local HD thread on AVS and see if other users are seeing the same thing, especially OTA. That should help you track down the issue.
