Hi, I'm Randy. Welcome to JustAnswer. I'm reviewing your question now, and will post back with your reply ASAP.
This sounds like a glitch in the firmware. The best option will be to try a factory restore. Do you have the content that you would like to save backed up on the tablet?
Try this on your Samsung Tablet please>
You can save the photos to your sd card, if they are already on the card they will be safe.
let me know if this works for you please...