intermittent stopping

I am looking for suggestions. I have an electric 1998 Club Car DS that randomly just stops. When it runs it runs great. I have replaced the solenoid and forward/reverse switch. While driving, typically right when I stop, the golf cart randomly stops moving forward or reverse but not always...

During a round of golf the cart will occasionally intermittently stop running. It sometimes will not go after I've stopped for a golf shot or at the tee box. I do not turn off the key when I stop during a round. The voltmeter reads 48 volts, but when I step on the accelerator nothing happens...