Maybe this is what happens when you're driving against or with the earth rotation, or some kind of relative Einstein compensation programmed by highly skilled Yamaha technicians.
I can see you live in sicilly and i don't want to pull out the old mafia stealing stereotype, but are you sure nobody has "touched" your bike while you were sleeping?

Sorry for the irrelevant post. Didn't mean to do any harm, but i just had to write something...