I also get the "service unavailable" message on only one channel (COZI TV, subchannel of Cleveland ABC channel 5). The stream freezes, then the message appears on my TV screen. This happens every few seconds to every minute or so, and only on this particular subchannel; all the others work well and do not freeze. Since this problem occurs on channel 5's COZI TV DTV subchannel (channel 5's main channel stream does not freeze at any time), is this something I will just have to live with, or is there a solution? COZI TV is one of my favorite networks, since it carries many TV shows I grew up watching; it is very annoying to see the picture freeze and the "service unavailable" window pop up. Is this an issue with my Roku player (Roku 1), the router, or something else beyond my control? Is this a problem TWC can correct or, since it involves a DTV subchannel, is it completely out of the cable operator's hands? I mention this because I was told just that (that problems with DTV subchannels are beyond TWC's control) some time ago, when I was having problems with a subchannel (this was before COZI TV was added to my Roku channel lineup; the problem I was having was with another DTV subchannel).