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. So I switch the run/tow switch on and off, wait 30 seconds, and sometimes this cures the problem, but more often recently, it does not help. So I continue to switch the run/tow switch until it resumes running. The problem continues to occur more and more often. The dealer repair tech came out for another problem and replaced the main controller ($400). That did not fix this intermittent problem. Has anyone seen this problem?