Canon Community

Put a 16GB SD card in the camera and everything is back to normal.  So what caused my SD card to stop working?  What format should I format it?

This is exactly the same thing happening in my Canon Rebel T3i. I'm still using the same 64GB SD card I purchased when I received the camera for Christmas 2011. I can't believe it could just be the SD card but I'll check it out and repost if it works...