trolled all day with the 150 merc yesterday, as i was comming to the dock at idle, i bumped into neutral to coast to it and the motor just shutdown. like i turned off the key. (even though i touched nothing). i reached over and turned the key and it started right up. is this something i should be concerned about? i never had anything like this happed before. what should i check?? thanks for any replys. this has got me a little spooked.