I have played ME3 coop for the past week. Sat->Friday had no problem getting into public games.
On Friday, I noticed there are 3 free multiplayer DLC packs. I installed them. Since installation, I have only seen one or two other players, no full public games.
Is the player-base fragmented by DLC installation? Do I need to uninstall the DLC to return to rejoin the majority of public games? If so - how do I do that?
(playing on PC)