Leebutt

Hi, I have a 2015 Yamaha nmax 125 that has developed a starting issue that seems to correct itself for months then Randomly reappears. I turn on the ignition and pull break leaver then hit the electric start button and every now and then there will be nothing, no attempt to turn over or noise. I’m thinking maybe the safe switch is playing up/ sticking some times. Any advice/ideals greatly received as to solutions And weather is an easy enough job to try with my very limited scooter knowledge. Thanks in advance Lee