PS3 keep disconnecting my internet connection

everytime when i play tekken 6 or MW2 online, my wireless modem/router keeps droping the internet connection. I have 3 computers at home all using wirelessly connected to this router/modem but it never has any problems, no drops, no resets. It only happens when im playing PS3 games, anyone know why does it happen or how to fix it? it’s killing me.