eed080b5_ol_cleaners____The_PoolCleaner__Solution
[Possible Cause] Obstruction in the PoolCleaner itself. [Video] 2 Wheel 4 Wheel [Solution] 
To determine if there is an obstruction, take the cleaner out of the pool hold it in your hand with the sticker facing AWAY from you now turn the right front wheel forward (right is where your right hand is). If the cleaner moves smoothly, you don't have an obstruction (check the system its not the cleaner). If it wont move or stutters you will have to clear the obstruction. Click here to see how.
Tech Support- Automatic swimming pool cleaners -- The PoolCleaner
Solution