my router keeps disconnecting when i play games online like wow and my modem

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dont howdo i fix this issue? i have broadband and a wireless g router with lan option it keeps disconnecting when i play online games like wow and diablo 2 i have replaced my router once and it still does it i dont get this issue when i plug it directly into my modem it keeps disconnecting me from the wow servers then reconnects and a little bit after that it disconnects again i dont get thst problem on any other game but wow and diablo2 help me plz