Sounds electrical as in a loose connection. I have found the round connector at the bottom of the Ignition most often to be my problem
Flag terminals have always been troublesome,the terminations are cheap but the proper tool to crimp them will set you back a couple of hundred dollars if you don't have access to a well tooled tech. It of course can be a loose terminal anywhere on the bike or internal to the switch. The 750 faq has a detailed listing on how to fix your switch. In the end you need to check all the wiring to nail down the problem. Get stocked up with your beverage of choice,put on some tunes and spend a day going over every wire,connection and especially those grounds. Intermittent problems take time and patience to track down and stomp their troublesome Gremlin like ways
The relay mods you can find here will also go a long way in chasing away the gremlins, VooDoo incantations never hurt as well as learning to curse in Italian
Very gratifying.. I have heard our Kiwi and Aussie brothers have especially fine tuned the art of incantations and especially powerful curses Then there are the very special,known to stop asteroids in their tracks Finnish curses 
Be very careful, they can be hazardous to innocent bystanders and young children 