Yamaha neos 4 stroke

Hi I have a 2014 Yamaha neos 50cc 4 stroke that starts but after a short or long journey the bike won’t start I have to wait for over an hour and try again sometimes it works but sometimes I have to wait longer
it has a new battery and has new spark plug I was going to take the carb off to clean but it has a fuel injector instead so thought I would ask for a bit of advice first

 

I had the same problem, turned out it was too big a gap on the spark plug, gap should be 0.7 - 0.8mm