Modern Vespa

Hello all, I need advice on a starting problem with my 2016 Sprint 150. The problem just started, I put the key in the ignition, turn it on all the lights come on, put on the brake, and press the start button,
Nothing, so I try again nothing, take the key out reinsert key, go through the process again and it starts. Recently it's been getting worse. I notice when I don't hear the fuel pump buzz noise, it won't start, could it just be my switch or something more involved?
All advice appreciated, thanks.

It's probably the switch, but anything else in the path of the "injection loads relay" could be the cause (although unlikely). The switches seem not have a long life...