Hi, I have a fist 500L diesel 2014 model and I'm having gear issues - lose gears intermittently. I've been told by a garage that they need it to be happening all the time so they can diagnose the problem, to avoid paying out hundreds in stripping gear box. Has anyone else had this problem? If so what was the issue? Thank you.

Welcome to the forum

I presume this is a Dualogic gearbox? In the 500 section you'll find a sticky thread detailing all the many, many known issues with this gearbox arrangement.