It sounds like a bag problem. If one bag is leaking, as the side lowers, the sensor begins leveling the other side until the bags are empty. I had to check mine twice to see which bag it was. I found a very heavy concentration of soap to water finally found the problem. WHat you need to do is raise the air height to full height, then spray the bag. If it is on the lower part of the bag, it gets folded onto its self, you won't be able to find the leak.

Give that a shot.

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2011 E70 50i M Sport