BMPCC says "No card" with right SD cards

While shooting a music video today, my BMPCC suddenly said "No card" I have another BMPCC that we were filming with and every SD card worked fine. I formatted the cards and that didn't help.

Has anybody else experienced a similar problem?

We were outside in 20° weather when it stopped working but I couldn't find anyone on the forms with this issue after shooting in cold weather.

Did you give the camera time to warm up? This is especially important in cold weather shooting.
Cheers