I have comcast also, but I didn’t have any interruptions with Fox today. There have been several occasions in the past that, for whatever reason, Fox has gone blank while all other channels work fine. I’ve found when this happens, if I change the channel from Fox and then right back to Fox, it starts working again. No idea why and I’ve not noticed the same problem with any other channel.
A few days ago FOX and several other networks were off the air on my standard cable but I never lost them on the digital channels.