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Comcast Cable TV signal pixelated then signal dropped!

I live in San Francisco. I've had problems with Comcast TV cable reception. The picture breaks up and gets pixelated and then the signal is dropped. I tested different TVs, checked the cables, unplugged and plugged it in again. Sometimes I get 15 minutes without signal degredation and sometimes an hour. Is it because Comcast is trying to push too many signals through the lines?
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