I will say that i always felt that the people working on the FW was just trying stuff, some times fixing one thing ruined two other things that was working fine before.
So yes those partners seem to be less than optimal indeed.
I cant remember about the first 2 x cams ( pre-production ) but the production one always worked great for me, i cant recall a single stop for camera reasons, but i had a few times where the PSU came loose, but the extension i use do that with all so i need to secure them with rubber bands or something.
O i also had a few SD cards die in the x cameras, but i think that was just bad luck and me running 3 of them at the time, so math dictate the chance of a card dying in a x cam must be higher.