My DZ28 has a unique problem. After using it usually for 30 minutes and, after many manuvers I hear an electronic click and then the motor wants to quit. Just that fast it will return to normal and run fine. I have tried to link this to steering handle position, seat or blade running. (All of these are safety connected switches) But, I cant find a common denominator. The clicking sounds like its coming from the engine area. Is there a way I can bypass the safety switches one at a time to narrow it down or even eliminate them as possible culprits?