I was shooting bridals with my Nikon D5000 (yes, dinosaur, i know) and all of a sudden it stopped letting me shoot and brought Up an error that read "cannot format memory card." I wasnt trying to format the memory card. I was just shooting then it would randomly pop up. It would make my whole production stop and wait while i turned my camera off then back on to try to make it go away. Sometimes when i turned it on it would be gone and sometimes it wouldnt. Im scared its going to erase all of my images in the middle of a shoot now. I just need to know if this is fixable or if i have to retire this camera. Thoughts?