When ever a Verizon On Demand commercial comes on the volume shoots way up.
Also, when a local companies commercial, one whos time slot would have been sold by a verizon marketing effort, and they are often directly following a Verizon On Demand add.
This occurs on SD and HD channels
Perhaps this is technically caused by a SD 2 channel versus HD 5.1 channel signal change.
However, for sure its marketing, its directly Verizon and they can do something about it.
It is extremely aggravating