Infrequent cutting out and magical recovery

[MFD]

Thanks for the suggestions. I'm going to try and get time to poke at all the wiring/connectors this weekend.

I've just been staring at the wiring diagram, but after half an hour the mess of diodes where the side stand and clutch switches meet the fuel pump and starter cut off relays still makes no sense. If the side stand or ignition switches went open circuit, taking out the coils, would I still be able to crank the starter?