Seems like after the latest graphical updates a lot of people are getting random blackscreens
This sounds like you have a corrupt effects package. I would suggest attempting to verify your cache.
If that doesn't work, try deleting all the files NOT located in deeper folders in the following 2 locations and verifying cache:
C:\Program Files (x86)\Steam\steamapps\common\red orchestra 2\ROGame\CookedPC
C:\Program Files (x86)\Steam\steamapps\common\red orchestra 2\ROGame\CookedPC\Packages\Effects
kk i wait for ur ResultWill check that and give you feedback afterwards