Sound Dropping and Picture Wavering - DirecTV DVR

For DirecTV TV services which include DVRs and receivers, Sound Dropping and Picture Wavering 1. All of our TV's with the exception of the main one has occasional drop of sound when watching regular stations. Fixed by switching to another channel then back to the original one. But then it may happen again later. Very sporadic.
2. All TV's including the main one are starting to have pictures that are occasional wavering. Happening during good weather.
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