Ran into this on an older bike and the WD-40 treatment did the trick permanently - which suggest my switch was simply dirty inside and that got it flushed.
If the problem persists on a new bike, and WD-40 only works short term, I predict either:
- There's some bigger obstruction somewhere inside, maybe a speck of plastic that got there during production, or some dirt, and it needs to be taken apart for a proper clean up
- The component is faulty somehow
In either case, I'd go to the dealer, report the problem, remind them the WD-40 treatment was not enough last time and ask for a closer inspection. You can also do it yourself, that switch housing is probably held together by like two screws, but you might lose warranty, especially if you end up braking some flimsy plastic tab inside.
For what it's worth, my 2015 Versys with 40 000 miles has a perfectly smooth switch - you shouldn't need to do repeated applications of penetrating oil to keep it moving. If they tell you "yeah, just keep squirting when it gets sticky", they're being lazy.
2015 Versys 650