I have the '19 corse and this happened to me after a longish ride last week. Didn't start until after I stopped at the shops for a short period, then on the way home, started to surge, throttle response sluggish. As I revved it a bit, it would cut out. Restarts every time, but within a few minutes, it would do the same again. Checked the fuel cap, had a bit of pressure so went and filled up. Full tank and still the same. Bike has 1000kms and a bit discouraged with the way it's behaving - anyone have any new news???