Ok.
So.
I still haven't found the cause, but I am making some sort of a list, with suppositions & platforms involved, wich is as follow :
-Vishnaya, CTD after multiple commands were issued (Raising, lowering masts, changes in speed & depth, etc). Plateform : Kilo Imp.
-CTD occured after counter-detection by a Victor III, DW original campaign, mission 3. Plateform : 688(i).
-Usually, no CTDing during missions if 3D interface is not accessed.
-Observation of CTD redundancy : Not crashing often when testing plateforms on a clean edited mission, but when a lot of plateforms are present. Guessing : maybe communications between plateforms is the cause (exchanges, behavior modifications, etc). Otherwise, more simply , possible memory buffer allocation for DW insufficient on my comp., but no clue as to how to enhance it.
-Usually, no CTDing during missions if 3D interface is not accessed (it does happen from time to time, but it's very rare).
I know it's not much, but reloading the game sometimes every 2 minutes can be annoying
.