That sounds like a manufacture date being flashed. Have you checked the battery? If you can't backup first, all your changes (custom sounds) will be lost, but that might be what you are looking at. Replace the battery, or have a service center do so. You'll want to reset after.
Try ROM check first.
Initialization: Hold Page + and Page - while turning it on.
Preload: Global Screen 5A, then select "OK".
ROM Check: Hold Edit and Global/Multi while turning it on.
Guide:
How to Initialize reset and preload on the Korg X5 X5D DR SweetCare
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