marjo, Thank you very much for joining the Intel® NUC communities.
In order to try to fix this problem, we can try to re-install some of the drivers: chipset, management engine and then the Bluetooth driver.
We can also try a BIOS update, using the F7 method, on the links below you will find the instructions of how to do that, and the .BIO file needed to do the update to the latest version which is 0042:
Please let me know the results of trying the steps above.
Any further questions, please let me know.
Hi marjo perfect, no problem, it is good to hear that the problem got fixed by leaving the machine unplugged. In that case there is also another step we can try if the issue happens again, it will be to clear CMOS:
Any questions, please let me know.