In addition to the flashing light of the turn signal there is also an audible signal to tell you the signal is operating. Could it be that you are hearing the audible signal? That would seem to be the most logical explanation.

If it is in good condition and has been serviced from new it will go the distance, but that implies that you will keep up the servicing and not neglect the car at all. Should you fail to maintain it the car will deteriorate quickly, no matter how well it drives now. And a word of caution, it is not possible to say that you won’t strike trouble in the future, but the BFII is a solidly built car that should stand the test of time.

That's the way every problem should be handled, unfortunately not everyone gets the same service.