1-5 games a particular friend and i play.. one of us cant connect

Basically one of us goes into loading screen, the others screen goes black and eventually it says "can't connect to servers check your netwrk connection" or something along those lines.. then "the game has crashed please try to connect". It is getting old. We have never had this issue until the last month. Nothing has changed except I got a new modem/router. But I dont think I've changed any settings in the router. Is there anything in particular I should change in the settings to avoid this? we are losing LP over nothing. PLEASE help
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