Help desk call

I have someone on the phone with me right now complaining about the reception on their TV.

The gentleman went into great detail about the set (one year old Panasonic), what happens to the picture (solid horizontal line, thin; dancing white lines, also thin) and the variation over time (usually works for an hour in the evening, crappy other times). He's blaming it on the internet access built into his building (RJ45 ports in apartments, wireless access from the roof of one of the buildings), which we do helpdesk and provide connectivity for.

Original entry.