so wait are you trying to instantly skip doors and in result the screen is black for 4 seconds? 
if so that isn't a bug. For each door you need to wait (or count) 2 seconds before you skip in order for the black screen to not appear. (some doors slightly longer wait time)

Bad door skip = time loss 

going into the registry and turning off sound and getting an instant skip sounds interesting though could you make a quick video without sound on ?