Chosen Solution
Belt came off deck, and i replaced it with a new belt. Started fine, but was really slow to engage blade, almost like it had to wind up. It will cut about 20 feet, then the blades stop and there is a a metal winding sound. If i engage the brake then the blades will start again. Tried messing with the throttle and the speed of the mower.
Have you looked under the mower deck to see if there is debris stuck in blades like wood or rock or wire?