We have a similar problem with a Vizio TV except it is usually the opposite -- our TV will turn OFF occasionally while we're watching cable TV in the evening. It NEVER happens while watching through any other HDMI input (e.g. AppleTV). Sometimes the TV remains responsive and we can switch through other inputs with the TV remote, other times the TV is completely unresponsive for several minutes. In rare cases I've had to unplug everything to reset.
Could this problem be related to the same (possible) malfunction of the primary Xfinity TV box?
BTW, it's rare, but I have gotten up early in the a.m. on more than one occasion to find the TV on. Again, not sure it's related but the entire experience is frustrating. Thanks again.
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