Canon 5Dmk3: After the camera reached 9,999 activations, it would no longer number the files Continuous. Every time a new CF card goes in, it starts numbering at 0001.

I have tried to Reset Manually and Reset Automatically and then set it back to Continuous file numbering, but it still won't number in Continuous mode. I thought that might jog it into performing properly.

How do I get the camera to number files Continuous? It is most definitely set to Continuous and problem only started after it rolled over at 9,999. .