Finally got my forklift working after replacing the EV100 controller and card. Problem now is that when traveling on a slightly inclined chip seal asphalt surface, when one of the drive wheels slips only slightly, the truck shuts down and I have to turnoff the key and wait for at least 30 seconds to one minute before turning it back on and getting the the contactors to re-engage and the forklift will move again. Is this normal? Is there a safety circuit that causes this issue?
Also with the battery at 37 volts, the unit will barely climb a 12 % grade (3 rise feet in 25 feet distance) concrete ramp into my shop. I would expect it to do this without a problem. Is this normal?

Am I missing something here or are these actions normal.