Hello Tknewbie, I’m sorry to hear you are having issues with your NUC, but please let me try to help you.
According to your comment, the system is working fine, but when you reboot it, it stays at the Welcome screen. Does this happen every single day?
Are you experiencing this behavior with other NUCs?
Would you please let me know which is the model number of the memory (RAM)?
Which is the current BIOS version of the NUC and the Operating system you have installed?
What we usually recommend on a regular motherboard is to clear the CMOS removing the battery from the board. In your case, would you please unplug or disconnect the battery wire from the connector and leave the system without it for about an hour?