Have 3 '03 600 REV's. 2 that we have run this year - one ride. BOTH are OK for awhile, then the lights on dash flash, motor boggs and quits unless you grab the key and press it down and maybe hold the contact on. First one, then the other. Second day riding one of them and it ran fine for 15 miles or so, then above happened 4x in the next few miles. Frustrating and not safe. Replaced key on one and it still happens. Anyone out there have same experience...a fix or suggestion?