My battlefield crashes after 10 minutes

It is exactly what happened to me. I have more information:

- the game always crashes and reset my internet connexion when I use mumble at the same time (without overlay, which crashes many games)

- the game crashes after a long time when I use Skype instead

- the game works pretty well if I use no communication tool

I think there is an issue related to network. I have other computers using the connexion at the same time and they still have internet. And none of them has a huge traffic (fetching mails every few hours, not more). So I do think the problem is in the game, and the last update.

Edit: I just crashed after 1.5 Ziba game, and I used no communication tool.