I have the 2014 model, just went past 6600km. Lowered my tyre pressure to 2 bar front and 2.2 bar back for a bit of Lesotho's dirt mountain pass travel, and then the trouble started.
Picked up 3 smileys on the front rim, nothing on the back. Had to nurse the bike to Mokhotlong with about 10 stops to pump tyres. Beat the smileys out with a claw hammer and continued the trip on to Sani Pass, had to do a bit more repairs at Himeville at the friendly guys from Yamaha, but made the trip back home with no more pressure loss.
The wheel is a little unbalanced at speed higher than 180km/h but has not lost any more pressure. I think the secret is to keep your tyre pressures above 2.4 bar.