Okay so I used to own the original lawn solution single hydro aerator and sold it to purchase a toro - exmark dual hydro unit... so we all know the dual hydro was not released yet so I purchased the toro single hydro unit. I am having problems keeping the machine in transport mode. I lift the bar to drop the wheels and sometimes it does not hold. Other times it will hold until I hit a slight bump. Then it will drop the tines on asphalt or a customers driveway. Is anyone else having this sort of trouble. The original toro machine I purchased did this so I returned it to the dealer for a new one. now the new one wont stay in transport mode.. Love the aerator but I hate having to hold the machine off the ground to move over driveways and what not.