I have a Zodiac MX6 pool cleaner in my in ground pool. The cleaner stopped moving, so I replaced the rubber treads which usually solves the problem. Now, one tread moves as it should, the other does not. And I rechecked the treads I installed. They appear to be installed correctly. So, my cleaner goes around in circles, until it gets to the deep end of the pool. Then, it essentially stops. I have had this cleaner about 2 years, so it is not under warranty. I don't know what to do. Can anyone help/have suggestions?