I was having an issue on 1 of my TV's all the time and 1 some of the time.
I finally got MTS to come to the house today and take a look.
They replaced all of the coax cable on HPNA side.
The person that came out was an MTS employee. He stated that the cables should have been changed when the install was done. The contractor just reused the old wires and spliters. The MTS guy was suprised that it was working at all. One on the "old" splitters was actually from radio shack.