Black screens when going out of navigation mode and cutscenes

Half of the time, when I get out of a cutscene or from the 3D navigation mode, I get a black screen that lasts for more than 10 seconds, before the interactive mode shows up. Any idea of what's causing this ?

EDIT : it's been solved via Chandler Avenue's Discord, channel #the-pandora-directive, using TEX4MOD.exe