scag wildcat electrical problem

hi i have a scag wildcat that keeps cutting off....running excellent while its running but then its like someone hit the kill switch and im sitting in the middle of the field dead in the water ...i putz with it and gets going again also sometimes it wont start and if i pop up the pto and put down again it satrts????? i have replaced the pto switch the starter/key switch and checked wiring but dont see anything obvios anyone have a suggestion or experianced anything like this i was planning on replacing switches on the drive / neutral arms the seat switch is bypassed i see there is some sort of relay and some other module so i guess ill replace them to