This message was posted on behalf of Intel Corporation
Have you tried updating the BIOS, you can download the latest version here:
Please see F7 BIOS Update Instructions for Intel® NUC
If this does not work, by any chance, do you have another SSD that you can try to isolate the issue? If not, can you try the SSD in another system?
This could be a compatibility issue with the SSD, please check the tested SSDs with this unit at the following link: