Write error

[JulioMartinsL]

Good afternoon,

I've been shooting with my xt4 and the same cards, for the last year and never had this kind of problem, but last weekend during a job, my camera showed the Write Error text.

Since I was filming a theatre play, there's no way I'd film it again, and proceeded to keep recording. It changed automatically to SLOT 2, and after a while, I've changed the slots. The second card, the one with no problem until then, went to the first slot, and I've put another one in the slot 2. After 5 minutes, the same thing. Write Error, on the slot 1. 

When I came home, I've found out that I've lost all the takes that had the Write Error. I'm assuming it's something related to the slots, since it happened to my two fastest cards on the slot 1 and not to the slowest, that was on the second. Both cards that had error, worked perfectly on the slot 2.

The second camera could film it, but my footage disapeared. How I'd lost 11 minutes on the first take, and 5 on the second, I tried to recover it with a lot of different programs and couldn't find any solution. 

Does anyone here has any sugestion on how to recover the files?