I'm also having the same problem. I can play for a little time then I loose the connection to the server.
I'm using a wireless connection but it's very strong and I have a fast internet connection so I'm fairly sure that it's not a matter of wireless or not for me.
Perhaps any settings in the router???
Please help, it's very frustrating. (Cable is no option for me)
I'm using a Logitech Dual Action control in the game, but I have a problem to calebrate the device. The car sometimes drives a bit to the right and sometimes to the left. I think it can be because it is a crappy game pad!?
But is there a setting that I can do to make the car less direct steered?