Volume keeps going up and down and turning off...


    I have a Galaxy S7.  For the past two weeks, anytime I play a movie, watch a video, listen to music, etc., my volume will keep randomly going up and down.  Now, it has also started to turn off whatever I'm watching or listening to.  I've called customer service and went to the store.  It was recommended I do a master reset, which I did.  The problem went away for a week, and then came back.  Anyone have any idea what the problem could be?  What's even stranger is that I have a Galaxy Tab S2, and it's doing the same exact thing, so I'm thinking there's some kind of software or hardware issue and it's not my phone.  Thanks.

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