Hi Pranav, thanks for helping me out here.
the update did something good for sure; the system is going in sleepmode now, kind off anyway. Still in a weird way though: the system seems to behave the same as I described before, but with 2 important differences. The system now shuts down really fast, in maybe 3-5 seconds, but it looks really to shut down: no flashing or burning leds whatsoever. But when I start the system up again it's going quite fast too, and with restoring all open programs etc.
So in the end it's like it should be, but I do wonder why I don't see my led flashing like it use to, as a sign that the system is a sleepmode?
I do have 2 remarks: I actually did not see any BSOD's for several months, I don't even think I ever saw one since updating to Windows 8.1, which is quite a long time ago... And I surely know how to recognize a BSOD, to my regret
So that is quite weird, I guess... And I did see in WhoCrashed there have been several error reports about this...
Also I'd like to mention that I've run MSI Live Update lately (as I do now and then); isn't it strange it did not tell me to update this driver?
Hope you have an idea about the (not) flashing led?