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Hi, I'm Nathan.Sorry to hear that you're having trouble, but I'll do my best to help you. Please give me a few moments to review your details here.
Are you saying this happens all on its own (volume goes up and down without you touching anything)?
Does it happen within an actual show, meaning during a single scene for example? Or does it happen mostly when going from a show to a commercial, between commercials, etc?
Does it happen on all inputs (dvd, cable, apps)?
The setting you likely adjusted was a "true sound" or "level sound" type setting, meant to level out the loud volume that usually happens on commercials. If you turned that on in the tv or cable box settings, go back in and disable that first, then we'll see if the problem is resolved.
Yes you did, but I was asking you to check if it continued the same way even after changing that sound leveler setting back off.