Sorry for the delay replying - for some reason, I never got an email notification on your reply Anyway, I do NOT use the FIOS router - I run my own, hence the coax lan. Anyway, I think I found the problem - just not sure where to go with it. I got the 1 actiontec moca bridge from tivo.com and it didn't help. It did at least let the roamio connect, but the link kept bouncing with 'moca bandwidth too low' errors. I got suspicious of that particular coax run, so I got a two-way splitter, and ran a 6 foot or so coax from the roamio around the corner to the splitter. The splitter also connected to the actiontec moca bridge. The input on the 2-way went to the coax to the rest of the house. Guess what? Works fine now! Obviously I can't leave it this way - I'd be better off sticking with the powerline adapter. That coax run is bad, or the wall jack is bad or maybe the 5-way splitter in the wall near the FIOS ONT is dropping the signal just enough to hose me? Kinda surprised if so, since there are two nim-100 upstairs that work just fine that are also off the same 5-way splitter. Maybe the roamio is fussier? If so, if I can figure out which cable off the 5-way goes to the roamio, I could try swapping it with a cable that goes to the 2-way, eliminating one hop?