Comment 23 for bug 1535048

Very similar situation here, however:

In my case there is absolutely no prediction of crashing. It just happens: instant shutdown followed by automatic reboot. Nothing to be seen in the logs. Happens under moderate load ; have yet to see it happen under full load (benchmark) or idle mode. So my problem might be related.

The problem exists in many different Linux distros. On one particular kernel on Opensuse leap 42.2 the problem did not occur, until I updated the kernel. Never happened in windows 10 that I used moderately for editing a 3d model.

Interval is random: can happen within 10 minutes when playing 0ad or upto days when performing simple office/multimedia tasks.

Quite annoying but very similar, yet slightly different to your problem I guess.

Similar hardware: i5 6267 with iris 550 graphics.

I will try your solution as soon as I have access to the laptop again. It will implicate reduced battery life I fear though if I see this correctly?!?