We frequently experience video breakup/pixilation/freeze-up and audio interruption of the local and national Fox networks. The problem does not occur on other networks/channels. Why is only one network or channel susceptible to interference when all others are strong and uninterrupted?
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Channels are bundled together, typically 10-12 HD channels will share one frequency due to Comcast's over-compression. It just may be that those channels are all on the same frequency that is suffering from noise, low signal level, or other interference.