Tries take the remote aparts,if can,some u can't they're tighten and latches from the inside.Take a rag soak it with some rubbing achahol and clean the PCB board and the inner rubbers plastics knobs on the sheet of rubber plastics that make coonntact to the PCB board.U tries take out the battery awhile and put in a brand new set of battery,remote might work for the volume button again.If not the volume control pad rubber knobe inner plastic pad that press down on the circuit board might be worn out or not making good contact anymore to the PCB circuit board.Or the remote control CPU chip are slowly shorting out the first command it take out was ur remote volume control functions.Try website like Remotes.com to buy another the tv original remote.
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