In Detroit, Cozi recently switched from 38.6 to 4.4 (from independent channel 38, WADL, to NBC affiliate, WDIV).
However, on my channels app there is no guide data for the channel. It just says COZI TV for the next 12 hours or so.
So, I thought maybe that WDIV just wasn't sending any data yet, but then I switched on my iPhone to the HD Homerun APP, and it has the data for channel 4.4.
Maybe just a glitch on Channels data?