I too have the 2016 model. I haven't had any issues like that.
However, recently i had to change the satnav power supply, as i was fitting a new Zumo XT.
The previous one was fitted at the dealership, along with heated grips, with the previous owner.
I was surprised to see how untidy and badly connected both were to the switched live port.
One of the take offs had been pinched in-between the fairing, because it was not zip tied back to the frame in enough places. The port had a very thin wire output that led to much thicker wires for the heated grips. No heat shrink, just insulation tape.
I was not impressed.
Cost of a few zip ties= pence. Cost of a new loom or a fire? A little more i suspect.
So i suppose my question is this. Was it the factory wiring or were someone had added/taken away something?