[superbeast5]

Hello, my PSP has been running greatly for the past 2 years but now the volume control is messed up, when i turn up my volume it automaticly drains down to nothing, i can hear it if i can get it up, but on the screen it shows it just going down, sometimes i can raise it and it will stay for 5 minutes at most but then it drains itself back down, i have taken off the faceplate and there is nothing on the metallic button, but i turned it on and played music and it still does it, i have reinstalled my firmware also but still no luck, is there anything deeper that i can try to fix this?