EOS-1D X Error 20

[Philip-Walsh]

I have a idx mk 1 and my camera froze bringing up an error 20 code. I sent it away to get fixed and it came back after having the shutter box and a pcb board replaced. The fault happened again and this tie no message and a blank screen. The repair company have it back but have been unable to replicate the fault Any ides?

[Waddizzle]

Did Canon fix it? Record a video of the issue after the send it back.