After the fall creators update when ever I try to put the PC into hibernation the screen turns black as usual but after a while it goes back to the lock screen , Also sleep and shutdown won't work unless I disable hibernation & hybrid shutdown. when I tried hibernating the PC using the following command "shutdown /h" the same thing happens with the following message : "Insufficient system resources exist to complete the requested service.(1450)".
I used to have the same issue with the insiders build leading to the fall creators update and now I'm using a freshly installed version of the fall creators update with nothing installed but the GPU driver "R9 390x" but still getting the same thing.