I have had the same problem with the History channel for years. I live in Lake Ridge, VA. I have had my DVR changed numerous times, the techs have been out several times to no avail. The signal strength is great, new splitters supplied by Verizon, new RG-6 cable AND THE PROBLEM STILL PERSISTS!!!!
I did find a solution: Comcast. I am completely fed up with Verizon with their super high prices and lack of support!