All new iMac 5K random restarts

I'm a Mac "veteran" (since 1994) user, but the recent behavior of my iMac end 2015 27 "5 K told me at the end of my piece:

After initial installation and configuration, the iMac just started rebooting randomly during the night. (It remained always off, never sleep.)

The only "smoking gun", I could find was the following:

localhost kernel [0]: cause of previous stop:-128

I talked to AppleCare a couple of times, my case has since been pushed up on their level 2 support. So far - no solution found.

Here are the things I've tried (I think that I have...):

  • Reset the SMC
  • Reset the PRAM
  • Most threaded the LaunchAgents and LaunchDemons
  • Re-installed Mac OS X 10.11.3
  • Implemented a new white 'test' user and restarted in Mode safe
    • Even in the 'Safe' Mode, strange things happen: after the rest (as a user 'test') for a day of two, the iMac "crashes" i.e. the screen remains empty and mouse or keyboard or "Power On" button on the back of the iMac are able to wake up the machine.
    • Also in 'Safe Mode' I get these trucks:
      [watchdog_daemon] @(wd_daemon_init) - could not open connection with the watchdog of the kernel

Short of "nuking & paving" the machine, has anyone got any ideas of what might help?

Or it sounds like a hardware bug?

Any help appreciated,

Greetings from Berlin,

Jan

Mine does exactly the same thing. Often during the night when it is idling. I only had the machine about 2 weeks.

Tags: Mac

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