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What is the make/model of TV? Sometimes the signal meter feature is hidden or put in a non-obvious location.
Occasional breakups across all channels seems very suspicious. It that is happening, then it would point to something local (near you as opposed to something happening on the broadcaster side) affecting your TV or signals. Are you aware of any ham radio operators in your neighborhood (look for really big antennas on neighbors' roofs)? Are you aware of any noise/glitches on your power lines (perhaps caused by appliances or power tools). Are there any nearby airports?
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