Android problem with htc explorer volume down button

mymatl

Disciple
For some reason since today morning my htc explorer is behaving weirdly. volume down button is keep on pressing itself. I tried to restart the phone then it went to hboot menu. after restarting couple of more times now the phone is on but the volume down button is on keep on pressing itself. during the call the volume button is keep on pressing down itself and cant able to hear others voice. Is this hardware or software issue? please help asap..
 
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