Just to be sure it's not the HDMI wakeup issue, try running this PC for a while with the Power & Sleep turn-off-after options Sleep and Screen both set to Never.
both were already set to never.
RvdBeek: Thank you very much for joining the Intel® NUC communities. We are sorry to hear the NUC is not working properly.
Even though you mentioned that BIOS and drivers are up to date, just to make sure, is BIOS version 0050 the one that is currently installed?
Same thing with the graphics driver, is it version 4729 the one installed on the NUC?
What is the model of the memory RAM you are using? Please provide size and quantity of sticks.
How many screens are connected to the NUC, do you have the model of them?
Are you using adapters or converters to connect the monitors?
For testing purposes, if you use the NUC just with one monitor is the problem the same?
Any further questions, please let me know.
yes everything is clear, i have update all drivers to the latest version and changed the driver of the graphic card to the basic microsoft driver. after this no problems anymore, pc's are running for more then 2 weeks now non stop