[Q] Problem with vol down.

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I notice a problem with my vol down, here is the symptoms. When i press vol down there is no immediate response, after few seconds of delate the system vol went all the way down to slient mode like I was press and hold the vol down button. I have no problem with vol up and I have no problem pressing both up and down to boot into recovery mode, but during recovery mode the vol down is still not working right. It also have the delate problem but doesn't seem to have press and hold effect while I just press it once.
I am running on Vibrant6 rom from the forum. Is this a rom/firmware problem or a hardware problem?
BTW it was fine when I bought it from ebay.

anybody?
bump!

*UPDATE*
I have try flash back to stock with odin still have the problem.