2015 N1K, bought brand new, broken in according to manual. Almost ever since I've had it, occasionally I'll upshift into something other than 2nd, ease out the clutch, and the bike acts like it's in neutral. At first it was between 5th and 6th, but now it's starting to do it in lower gears. Of course, it doesn't do it when you ask the shop to look at it and they can't duplicate it. Apparently, I didn't have synthetic in it , so they put that in at the last oil change, thinking that's what it needed. Still does it. My neighbor, a veteran sport bike rider, suggested that it could be that I'm shifting at too low of an rpm for that engine. So I've made it a point from time to time to make sure I shift at a higher rpm, but it still does it. Anybody else experience this? On the road it's not all that big of a deal, except that I know it's not normal, but I certainly don't want it happening at the track. Thanks for your help!