CrossFire Network Problem

Okay, So I bought the new Dell Inspiron 1545 laptop. c:
But the problem is, after an hour of game play on CrossFire, The game lags and then I get disconnected. And after it disconnects, my internet is completely gone and we have to repair it. This has happened at least 4 times to me.

Is anyone else sharing the same problem?
How can I fix this?
And is this a CrossFire problem or the laptop network problem?

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