Mine went in for 6k service... when I went to pick it up I noticed a cable tie holding the front right lens on... so back in I went.... service guy came out, "Oh Yes! Funny that was, it just fell off, never seen it before", so... why didn't you put a new one on... my mate came here a few weeks ago and had 2 replaced under warrenty... mines still under warrenty.... he took one off a bike in the showroom...
So yes I think its an issue beyond a certain age, mine is 3 at end of June... its kept garaged too.. maybe the glue is just shit..