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Every time i play a multiplayer game with my friends it's disconnecting.Sometimes i can get back to the game and sometimes no.
My internet connection is fine and i can surf when it's disconnects.
Is there something i can do?

the number one likely thing that causes behavior that your experiencing is that a antivirus , firewall , etc is blocking either the program it's self on your machine or more likely stopping the flow of data that has to come and go through the open door "or port" the the program has to create to connect to the server and by proxy other people's computers.

Check to make sure you have exceptions made for the client etc in your anti virus / firewall