1vs1 online private lobby game crash after 40 minutes


when i try to do an online game against my friend in a 1vs1 match, it crash after 40 minutes. Sometimes after 10 minutes. We are connected fron two different countries.

We can create the private lobby
we can start the game
the way game crash is: the One, that have created the lobby, have after 40 minutes an immediate closure of the game and return to the windows desktop main page. the other one remain in the maps and win the battle.

both me and my friend have modified the file paging of our systems and increased memory

thanks for helping us!!