Abrupt change of display-color after sleep

I POSTED THIS IN THE iMAC DISPLAY-SECTION OF DISCUSSIONS BUT NOBODY REPLIED:
After I wake up my iMac 27, after it was in sleep-mode
for some hours, colors look different for less then a second (warmer),
then it changes to something more cold/bluish. The change is exactly like
a manual change of the calibration/monitor-profile via settings.
There is NO blackscreen between the change of the colors,
like I said: exactly like a monitor-profile-switch.
I didn't change/add a different profile than the standard yet.
Is my monitor faulty and/or what's happening with it?
PS: I can't tell if the "less then a second visible"-profile is superior,
but i'd like to test it, if possible I installed all the latest updates.
But amongst them there wasn't that firmware update. Maybe
cause I CTO'ed the iMac a few weeks ago.

Haven't experienced this on my i5 iMac, but my monitor is hardware calibrated with a custom profile (first thing I did when I switched it on). I use the ColorMonki device.
I would recommend you hardware calibrate your monitor and see if the issue re-occurs. If it does contact Apple Tech Support for further advice

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