2003 club car 48 volt parkway, year old batteries, lights, wiper etc all work fine, cart operated fully normally speed wise. I have a long driveway, going up, fairly steep in some sections. when i head up, it goes beautifully all the way to the top, no bogging down at all. however if i stop on the steep section, it will not go forward again, pedal to metal just sits there, after say 5 or 10 seconds of the pedal down, i hear a click and it rolls backwards. if i back down to less grade and start back up it goes fully normally. i don’t get it. does anyone have any clues?