2016 club car president 48 volts with volt meter. stop cart and sometimes the power goes off(volt meter goes off). driving down road and the power goes off. wait a few minutes and the power may come back on may not. turn the tow switch off and back on and the power comes back on. sometimes only for a few sec. and sometimes for a long time. had it in shop replaced the pedal control worked fine for two rounds then started again. anyone have any ideas on what.s going on????