Repeated "Out of Sync"

Hello everyone,

I open this topic to ask if I’m the only one who cannot play in custom games ?
In fact, I try for several days to play with a friend on custom (2v2 AI) and everytime near the tenth minutes of playing we got a “Out of Sync” disconnection and I don’t understand what the problem can be.

The only thing I know is that we both don’t have the “Awakening Nightmare” expansion, we already have played together, and that my game is in english and his is in french.

Are we the only ones to get this issue ?