I think the tiny grub screw that holds the key to the fob is working loose.

I presume it requires the tiniest allen key I would ever have seen to tighten it.

Is this something an authorised repair should would fix for free?

Isn't it a small roll pin that just need pushing back in?  Never heard of them using grub screws for this...

Might be! I would need a magnifying glass to check...

...or just try pushing it back in (which worked!)

 

Thanks. That avoided some embarrassment ;-)