Freeze after Display Sleep

Hey people, I’m having an issue where the Hac just freezes after waking from display sleep. Mouse just appears briefly on lower res monitor on a black screen upon display wake and I have to force reset it.

Specs are: i7 2600k, GA-B75M-D3H, GTX 1050 Ti, Sierra

4k monitor on DP, 1280x1024 one on DVI

iMac 12,2 SMBIOS (Tried MacPro 3,1 SMBIOS. Seemed to fix it, but oddly causes machine to not finish booting if DP is plugged in from start, not much of an improvement)

Help much appreciated!

submitted by /u/proclotoid
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