If you have a high main drain, you need to use the tires with the larger bump on them and that will prevent the cleaner from hanging up on the cover breaking the skirt. Did you ever try calling them about it? They are usually pretty responsive although now that Hayward owns them, it might have changed.
I have had the suction cleaner for going on 9 years without incident and I think it is a pretty good cleaner. BTW, I leave mine in my pool all the time too but it doesn't seem to have shortened the life much.
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