I have a Windows 7 Asus ROG Laptop with WMC and I use three Xbox 360 Slim as extenders connected to each TV. Have been hardwired via Powerline Ethernet to each Xbox using Netgear WNDR3800 router. Setup worked great. Recently I purchased an Asus RT n66u router and I have the same setup in place. Now I am getting this "Viewing and listening conflict tuner unavailable" error interrupting viewing for minute or two whenever I watch WMC either directly on the laptop, which acts as WMC server to the Xboxes, or when using the Xboxes. Some are hardwired some 5 GHz wireless but problem is same with all.
Here's another thing. As I watched TV directly on laptop WMC, which is hardwired Ethernet to router port as is HDHR Prime TV tuners, I also had browser window open watching MLB.TV which is an Internet video streamed live broadcast. WMC connects to the Silicondust HDHR Prime tuners via my local network (laptop and tuner Ethernet wired into same Asus rt n66u router), & the HDHR Prime connects to coax from my cable tv provider. When I had the viewing/listening conflict error message on WMC the MLB.TV stream stopped simultaneously. Happened three times like that. The WMC error ruins recordings and viewing of TV shows and happens with almost every TV viewing now. The fact that it occurs simultaneous with interruption of the MLB.TV Internet stream makes me think my router is the issue interrupting/affecting both local home network as well as Internet access, just periodically disconnecting any laptop, tuner, or xbox whether it is wired or wirelessly connected to the RT n66u.
Does anyone have any experience with similar problems and know how to set up the Asus RT n66u correctly to avoid this issue?