TV sound problem - DirecTV

My TV sound gets loud and low back and force. It's so annoying! It gets fixed for a few minutes after fallowed the instruction of trouble shooting online, but soon again this problem came back. I wish a technical support representative from U-verse to explain to me why it keeps happening and/or send some technician to fix it permanently.

This question, "TV sound problem," is about DirecTV channels, programming, equipment, and sports.

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