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Freezing, pixels on 820 Fox

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Freezing, pixels on 820 Fox

For several days now, channel 820 Fox has been freezing and pixelating. The signal for 820 has been very poor. All other channels are working fine (including 821, Fox Business).  

Also, the menu setting for “Signal Strength” no longer works. It now always says: “Unfortunately, we cannot detect your signal strength at this time. Please try again later.”  But it no longer works - ever. 

Rebooting box does not resolve.  Any ideas? Thank you.