My parents have two HR20-700's connected through a SWM with DECA adapters for whole-home viewing. The ethernet port on one of the HR20's has recently gone out. The light on the ethernet jack does not come on, even if I connect it directly to an ethernet switch. I decided to bring one of my HR20-700's (which also has been on a SWM/DECA system) to their house and swap out temporarily with the bad unit to verify that everything else was working properly. That's when things got weird. When I connect my HR20 to their SWM/DECA, the network works fine and can see the internet, but I keep getting signal loss, pixelation, and 771 errors when watching TV. This unit was working 100% at my house, and if I plug the bad unit back in, it has no signal issues at all -- just the obvious lack of network support. Any ideas what could be wrong? I'm baffled. Your input is greatly appreciated.