I had a similar issue a few days ago. While playing the sound level dropped down quite a bit almost sounded like it went mono on me. I lowered the volume and then raised it back up higher than it was set to around the 26-28 levels and it seems to be back to normal. Only played a few games since I raised the level up so I don't know if it's going to last. I haven't moved the pin other than to adjust the pitch until it plays the way I like it since it was delivered from JJP new NOV/2014. It does get nudged during game play so it could actually be a cable needing to be re-seated. If it happens again I'll start checking connections.