Went out for a quick run last night with a friend who was in town visiting. While on the trail the bike on 2 different occasions ran a little rough and then stalled and 3 other times it just stall with no warning at all. Each time it stalled it started back up with a quick flick of the key and we were back on our way. Never had the issue before and don't want to have it happen again. It was stalling mostly when we were at low RPM's or at idle and sitting on near level ground. Anyone else have any issues like this?