MHP3rd on Mac crash online

[Hynotize]

Hi every one,
I recently downloaded PPSSPP to play Monster Hunter portable 3rd with hamachi. Everything seemed fine playing alone, but whenever I go in the online hall, i can only play about 10 minutes before the game closes itself, without having any error message..
I have the latest version of PPSSPP for mac (1.5.4) and I've tried changing some settings but nothing works...
Also, I live alone in an apartment, and for my internet connection i use my phone (sharing connection, 4G)