how would i increase my TCP/IP on a versalink 327w router using att?

i try to play battlefield bad company 2 and it disconnects me about 5 minutes in each round i play. i read online that you must increase the TCP/IP timeout something but i have no clue how. once again i have a westell versalink 327w and the provider is att. also its my dads router and he has it hooked up directly to his computer and i have the wireless part....if that helps anything
yeah it isnt punkbuster. it just says connection to the ea has been lost. please reconnect or something along those lines. i had the punkbuster issue with battlefield 2142 but this is not punkbuster.
 
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