This has to be a record, picked my GSA/LC up yesterday morning the same afternoon starter switch FUCKED won't more either way 
NN fcuks you over
If it is the same as the standard GS, then mine played up the first time I clicked it upwards to kill the bike. It then stuck solid. As I was in the middle of Wales and had to get home I just used a fair degree of force and it then yielded, but I do mean pressing to the point of expecting it to break. I was getting desperate as I was at a tea stop surrounded by an amused audience of cruiser riders and it was kill or cure. It has been OK since.
Silicone spray.

Beware that spaying chemicals into the switches might 'rot' the little rubber water seals on the micro switches.