a buddy of mine has a 08 500 es and it had this problem a few times when it was new. we finally took the connector loose and cleaned the the terminals with brake cleaner and compressed air, then we put dielectric grease in it. haven't had a problem with it since.
07 750 Brute Force
31 outlaws on ss312 wheels, 2 inch ss atv lift, mimb snorkels, relocated radiator, hmf slipon utlity, dynatec module, dynojet kit, VFJ stage 3 clutch w/ red primary and orange secondary, 5000 viper winch w/ rope
12 commander x
5000 viper winch w/ rope, bad dawg roof, emp full windshield, emp cv guards, xt fender flares, ssv radio, 5000k hid headlights, snorkels, low range sport mod