Game crashes at ceres fissure missions

[VanguardT-EN-]

As the title says, i'm having guaranteed crashes when doing ceres void fissure missions(it will usually happen before i get to open the fissure). First the FPS gets to very low values, like 20 or 15, then the game crashes a few seconds later. And sometimes i even get an insufficient video memory alert too. This is very weird because i'm usually running the game at 50~60 fps without trouble, also, this never happened before the SoTR update and it will not happen if i'm in solo mode. I tested running some ceres missions without fissures and the game did not crashed, although i had some heavy FPS drops. Running on the lowest possible settings didn't solved the problem too. 

Here's my PC info: 

Windows 7 Ultimate 32 bits

Nvidia GT 520 2GB

4GB RAM (3,12 usable)

Pentium(R) Dual-Core E5400 2.70 GHz 

Foxconn G31MXP motherboard