[cwl1979]

Any chance you may have a weak bag? Look and feel very carefully around the base of the bags and see if they are brittle or if one feels ... breezy... From a commercial driver point of view it's usually a bad bag with wear holes under the roll at the bottom. If not change HCV. Bag will come up to a certain height and that's all it's got. Loses so much air that you can't even hear it. Super frustrating when you 500 miles from cell or truck service at 20 below.