What should i do
A common issue here is the actual switch the volume down activates--they are called micro switches (as tiny) and what can happen is the actual switch which is only supposed to activate and when pushed but activates on its own.
They are called momentary since they only work when button is pushed.
Volume buttons/switches on cable boxes can do the same thing but it is rarer.
What needs to be done to confirm or disprove that this is our problem is the small circuit board with all the exterior controls needs to be removed and the (in your case) vol down button's switch needs to be un-soldered and removed----if problem is gone you have two choices:
Locate and replace that tiny board with the switches (they rarely sell individual switches) OR with the bad one removed just put the board back and operate the set with a remote---you will only be missing the volume down feature on the set itself.
Easy to remove as only two solder connections for the switch itself--may be two more for a metal piece it is mounted in.
If that does not cure this----some kind of odd problem around it.
Also when this happens the remote may not work as the manual controls have priority over the remote.
if questions let me know.
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