Last weekend I played a game of woodsball, shortly after we were done my 20oz Co2 was acting like it was empty. but I just got it filled up the Wednesday before we played. So I thought it was strange but didn't think it was a big deal, so I went to get it filled up at our local pb store,but the guy that fills them up there check my tank and said it still has 11oz left in it.And it is still acting like it's empty.Help
