From a recent job we were at I learned that the cable boxes actually have a modem in them which gets used for the on demand stuff. So does a hd dvr count as 3, 2 tuners and a modem?

Also learned that the return and line noise seem to be the two most important numbers to look at. But you need some good test equipment to do so. However, you can log into the modem and get this info for both the Internet modem and t the cable boxes.

If cable company tested and said its fine, it sounds like hardware issue.

+1000....