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    NUC6i7KYK2 (Skull Canyon) spontaneously reboots


      Just bought the Skull Canyon. And what a great NUC it is.


      But, within 10 or 15 minutes after a cold boot the Skull reboots spontaneously. And done this a least seven times in a row.

      Logged in to windows and than you click a round, not doing anything important. Waiting for the reboot to occur.

      After that it stays stable even under heavy load.


      Populated with 32GB of ram. And for storage 512GB SAMSUNG 950 PRO SERIES-NAND M.2 (2280) NVME

      BIOS is the latest. OS windows 10 pro.

      Installed all the Intel drivers.


      What is the best way to troubleshoot and solve the cause.

        • 1. Re: NUC6i7KYK2 (Skull Canyon) spontaneously reboots

          I would suggest two things:


          1. Download and run MemTest86+ and test your memory for a few hours (or day).
          2. While you are in Windows, run an application that can display (and better, one that can log) the temperatures of the CPU, Motherboard and the SSD(s). I personally recommend AIDA64. This is an app that costs money (worth it IMHO), but you can use it for a free 30-day trial beforehand. You can also run applications like SpeedFan and HWMonitor, but these applications don't truly understand the NUC boards and may display voltage and temperature sensors incorrectly (i.e. displaying non-existent temperature sensors and/or not displaying working sensors properly)...


          Hope this helps,


          • 2. Re: NUC6i7KYK2 (Skull Canyon) spontaneously reboots

            Ok, but it happens once just after cold boot starting up the Nuc. So can it be a heat problem that soon.

            And after the spontaneous reboot I have hit the F2 key to look at the BIOS and the temperature is normal within range.


            Also after this reboot I ran Blender to render for hours 100% CPU use without a hassle. Or Crystal mark, flawlessly.

            The nuc is on now all day, with no reboot whatsoever.

            • 3. Re: NUC6i7KYK2 (Skull Canyon) spontaneously reboots

              Run the memory test and we'll go from there...

              • 4. Re: NUC6i7KYK2 (Skull Canyon) spontaneously reboots

                Used this tool a week a go: Breakin » Advanced Clustering Technologies

                At work www.gigaserver.nl we build to order servers and use, amongst others, the breakin stress-test and diagnostics  to 72 hour stress test.

                The nuc runs the breakin test without any problems for hours.


                Core 67° C, memory 68°C, mainboard 51°C, PCH 54° C

                • 5. Re: NUC6i7KYK2 (Skull Canyon) spontaneously reboots

                  As I have said elsewhere, I believe that the issue is in the support for NVMe drives. Whether this is a hardware (board), firmware (BIOS), software (driver) or (particular) NVMe drive issue remains to be determined. I find it interesting that the problem seems to always be tied to the Samsung NVMe drives (there are zero reports of this issue occurring with SATA drives)...



                  • 6. Re: NUC6i7KYK2 (Skull Canyon) spontaneously reboots
                    Intel Corporation
                    This message was posted on behalf of Intel Corporation

                    Try to do a firmware update on your SSD, contact your system manufacturer in order to do the firmware update.
                    My guess would be the power adapter or SSD. Test the system with another one if it possible and test RAM again. It will be hard to isolate the issue if it happens randomly, reboots can be related to a bad capacitor as well.
                    Please let me know if this happens more often or if you need anything else.

                    • 7. Re: NUC6i7KYK2 (Skull Canyon) spontaneously reboots

                      Thanx for the advise,


                      The Samsung NVME storage has the latest firmware, memory seems to be fine.

                      Tested it with the tools we use for troubleshooting servers. The NUC gets "soaking hot'. The fan is spinning full speed.

                      When testing it. But the system remains stable. It will not reboot or freeze. Great job done by the designers ;-)


                      It looks like only to happen after a cold boot.


                      After 'cold' starting up the NUC and logging in to windows 10 pro after 15 to 20 minute the NUC restarts.

                      Then it stopt after rebooting at a black screen with white letters a message is saying:


                      BIOS has detected unsuccessful post attempt(s).

                      Possible causes include recent changes to BIOS

                      Performance Options or recent hardware change.

                      Press 'Y' to enter Setup or 'N' to cancel and attempt to boot with the previous settings.




                      Now you can Y enter the UEFI(BIOS) or just press N


                      So the solution I use now is to ALT F4 in windows to do a manual warm reboot.

                      After the second reboot there is no message screen as mentioned above and

                      after that the system is stable all day even under heavy load.  it will not reboot again.

                      • 8. Re: NUC6i7KYK2 (Skull Canyon) spontaneously reboots

                        Having the identical problem with the same hardware. I've taken all the same troubleshooting steps with the same results.


                        What an odd problem. Cold boot, 15 min later a spontaneous reboot, then it'll run as long as I like, days or weeks, with no issues.

                        • 9. Re: NUC6i7KYK2 (Skull Canyon) spontaneously reboots

                          I also am experiencing the issue with a random reboot not long after powering up the NUC6i7KYK2 in the morning. 


                          I never had the problem with this NUC the first several weeks I owned this......until the last couple of days after I upgraded the BIOS from 0034 to 0035.  My sense is that there is something related to that BIOS version that is contributing to the problem.

                          • 10. Re: NUC6i7KYK2 (Skull Canyon) spontaneously reboots
                            Intel Corporation
                            This message was posted on behalf of Intel Corporation

                            Try a BIOS recovery; you can download the latest bios version here:
                            Even though you have the latest BIOS you can do the bios recovery with the same BIOS version 0035.
                            Please see BIOS Recovery Update Instructions for Intel® NUC

                            • 11. Re: NUC6i7KYK2 (Skull Canyon) spontaneously reboots

                              Very same experience here: unexpected shutdown 5 Minutes after cold boot even when doing nothing. I am running Windows 10 on a Samsung 950 Pro 512GB, but on a NUC6i5SYK.

                              • Upgraded to latest BIOS 044, also did BIOS recovery
                              • I ran memtest for 2 days without errors
                              • I ran Prime95 100% CPU during 4 weeks 7x24h without any hickup


                              As a workaround, I put the NUC into sleep. After resuming from sleep, I never had this issue.


                              Quite interesting statement from Scott, that these issues are with NVMe drives only. It looks more like a physical issue causing the NUC to shutdown, as Windows is not even able to present BSOD.

                              • 12. Re: NUC6i7KYK2 (Skull Canyon) spontaneously reboots

                                Done a recovery BIOS. "And till now no cold reboots anymore ;-P" So fingers crossed.  Nope it still reboots :-(


                                Update: A BIOS update to KY0037 was the solution. To get rid of the cold reboots.


                                The procedure was a bit different than said in the instructions. And the jumper went broke.


                                If you remove the jumper and power back on and start the NUC, after first placing a@ USB thumb drive with the correct bios file in one of the USB ports.

                                The system keeps looping and looping starting up, shutting down.... So maybe the USB stick was in the wrong port. Or to big a Gigb. USB 2 or 3. Whatever.

                                Nope nothing seems to work. Even changing the bios file name in all CAPS did not help.


                                And when removing the jumper the metal part was left behind. Still connecting the pins. Hardly to see. So I had to pry the metal part off as well. And put it back together later.


                                After placing the repaired jumper back and powering up the NUC a screen popped up with options. The last line said hit F4 to do a BIOS recovery. So I did.



                                After recovery is finished power off and removed the power cord.... Power on again, push button started up the system. Did not go in to the UEFI/BIOS.

                                But linea recta into Windows 10.  Powered off the system pull the plug from mains(electricity). Waited a while.

                                Then reverse order, logged to windows typing this reply. And experienced no reboot.

                                So tomorrow Dutch local time, I will try again. And let you know.



                                After 8 hours away, cold booted up the NUC. And guess what. It still reboots, same behavior.

                                So back to square one ;-(



                                A BIOS update to KY0037 finally was the solution. To get rid of the cold reboots.

                                • 13. Re: NUC6i7KYK2 (Skull Canyon) spontaneously reboots
                                  Intel Corporation
                                  This message was posted on behalf of Intel Corporation

                                  Thank you all for the information provided on this post, orkey I hope you can have a better experience with the Intel® NUC from now on.

                                  iPat is it possible for you to try different power adapter just to try to isolate the issue or you're not experiencing the issue anymore?

                                  Best wishes,


                                  • 14. Re: NUC6i7KYK2 (Skull Canyon) spontaneously reboots

                                    What is the rationale for doing a BIOS recovery if the system is running properly and if the BIOS installed without errors? Is the assumption that there is some errant bit flipped somewhere? Wouldn't that be detected by checksum verification when BIOS loads? I was under the impression that BIOS recovery was necessary only when it was completely broken and unable to load.

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