If anyone think your DVR/DVB box is the problem
I can tell you that I have tested several old and new Denon, Marantz, onkyo, pioneer with the same DVR/DVB boxes with NO problems
Denon 4311 / AVR-A100 is the problem for sure !
Ps ... I do hope you understand my swenglish. If not, please ask me what I tried to wrote.