Board Thread:General Discussion/@comment-8.17.58.3-20140822202005/@comment-24739965-20140823033554

It could be matching limitations. If you disconnect from a match early (Or somehow got dissconected from PSN), the game will limit the matches you can find and join. If this continues to a certain point, you couldn't search rooms, or even do quick match. Only doing complete matches can turn it back to what it used to be.