When I lost my SD card I had the same issue, so it's likely an problem with your memory device. Try using a different SD card, or even the whole "take it out and put it back in" reset trick.
If there are any warnings or error codes that pop up, they'll be incredibly helpful in identifying what the issue is. Otherwise, I'm not sure how else I can help. I would suggest you fool around with the settings and try experimenting with what works and what doesn't to see what you can learn, but I'm not sure tech savvy you are, so that might be a bad idea.