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Question: Sleep Wake Failure

iMac reboots in sleep modus after High Sierra Upgrade "Sleep Wake Failure"

The problem still remains after update to macOS High Sierra version 10.13.2. (iMac model 13.1, late 2012)

When High Sierra was released I took the upgrade like I always do. When my iMac goes to sleep my system is rebooting after a different period of time.

The startup sound plays twice. Then the apple logo appears on the screen with and progress bar (as if something were installing).

Once High Sierra starts it displays a message "Your computer was restarted because of a problem: "Sleep Wake Failure"

I can’t find a solution for the problem in Apple Support or on the internet.

Looking for help.

iMac, macOS High Sierra (10.13.2), iMac model 13.1, late 2012

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Question: Sleep Wake Failure