When I started playing Dirty bomb at the end of closed beta and in the first days of open beta I had no problems finding games with Quick Join.
For the last few days, every time I start Dirty Bomb and hit Quick Join I find a game, no problem. If I leave the game after its finished and return to menu to search for another server via Quick Join, it tells me there is no possible game to be found. I then have to use the very obnoxious game browser (btw devs: At least some search criteria shouldnt be too hard to implement there) to find a game…again no problem. But the Quick Join stays broken until I restart the game, then it works again for one use only.