Why don't you try sending it to Leica with a polite explanation? Or email first, and get a commitment from them.
Chances are very good that if it is some sort of assembly or manufacturing defect, they will fix it for free. Or at least at a minimum price.
Are you the original owner? 6 bit coded or not? To your knowledge has it ever been dropped or mishandled? If you shine an LED flashlight through the elements, can you see any flaws, haze or fungus? You will almost definitely see a little dust......this is nothing. But if you see any haze, etc, the problem is serious.