How can I prevent this?

This is happening to my Polaris 280 nonstop. Several times a day. Very frustrating. It's bad enough when just the hose twists around itself, but when it backs over the water inlet valve, it loops into a true knot that requires the pumps be turned off to unravel. Of course, 10 minutes later, same thing.
 
Looks like the bag has a lot of debris in it. That can cause the cleaner to be a bit top heavy and make it lean as it climbs and ties itself in knots. My neighbor has same problem and emptying the bag more often helped.
 
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