So, i removed those mods :
- LifeBoats&Debris_V4
- GWX-Ehanced Damaged Effects
- Torpedo Damage Final V.2.0
- TheDarkWraith_DC_Water_Disturbance_V4.0_SH3
- TheDarkWraith_Ship_Plane_Fire_Damage_V1_4_SH3
- SH4StyleFlags_GWX
and i loaded a good saved game from my last test patrol (with 1 convoy).
Game loaded fine as expected, and i moved my sub in position and wait for the targets ; i sunk one ship and 2 was wounded and sunk a bit later. I evade the convoy deep and slow, and when they get some distance, i surfaced the boat. No visual contact ; I let the sub moving away from them a few miles more and saved the game.
I quit SH3 and reload and guess what --> Game loaded fine
Of course, i should begin again the thing for confirmation, but still, it's a big step forward (in my particular case, maybe), this is the first saved game (after sinking ships) who works ok since a lot of hours/days/week of playing !!
So, i will now re-activate mods, one by one, and repeat the shoot on this convoy. i will of course let you know the results.