I agree with Richard that further information and evaluation is needed. My first guess is that you may have the dump solenoid for that valve sticking partially open and releasing air. It is possible that the bag itself could have a slow leak but those are pretty sturdy bags. A solenoid is fairly easily changed out if you have any do-it-yourself leanings.
I would certainly take Richard up on his offer. He has certainly helped me out over the telephone and by email since we aren't nearly as close geographically speaking.
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