It was working for a few days then WIN 10 errors with "A bootable device has not been detected" go to BIOS setup, it was no longer seeing SSD PCIe plugged into M.2 Slot. I ordered the second SSD it had the same problem, the NUC did not detected SSD on PCIe bus  anymore. After 1-2 hours talking with 2 technical support persons from Intel both said that it was defected motherboard after we upgraded the BIOS firmware to the newest version.  Amazon sent me the second SSD very quick but it did not work out in this case and thank you.