I have used the FCL-918E electric door lock for a few days, and suddenly there is a phenomenon of data loss, and it will not work even after power off, what is the cause?

Hello! Thank you for purchasing our company's products! The memory chip memory overflow will cause data loss, the FCL-918E electric door lock supports a maximum of 1,000 users, do you have more than 1,000 users who issued the card? If not, please re-add the card and issue the card. If this happens again, the memory chip should be broken, please contact the salesperson and send it back to the manufacturer for repair.