Local Channels Go Out and Come Back Every Few Minutes

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@Gcshep wrote:

On my X1 box only, my local channels will go out and come back every few minutes. The screen goes completely black with no sound. This doesn't happen on national cable channels, and it doesn't happen on my other boxes. Any suggestions?

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cable linear (numbered) channels are carried to your home on different RF channels. you appear to have interference in some or several of those RF channels. check your cable connections and if all are tight you can call 800-comcast and request a home tech visit.