My first thought was check your starter button I believe it may have gotten gummed up n the starter contact points in the switch itself may not be making proper contact on the slide?
My next thought is a break in a wire some where in the harness near the neck of the motorcycle which is causing it to short out n show only one side working turn signal etc? Or a blown fuse?
another note,my owners manual calls for reg gas n thats all I ever use,if I run premium gas it runs ruff.I do use
some sea foam abt every other year n run some thru.