Greetings MechWarriors,
We've identified an issue introduced as of the May 17th patch that can cause Quick Play match connections to fail. This issue manifests as endless loading at the voting results screen, and in some circumstances a disconnect to the MechLab. We are currently working on a fix for these issues, planned for inclusion into a hot fix early next week.
In the meantime, if you experience extended loading at the voting results screen, shutting down your client, relaunching, and rejoining the match should connect you to the match in question. Less commonly the match itself may not be active, and you will not have the option to rejoin.
We apologize for any frustration this issue may cause, particularly as we head into the weekend. We will send out the fix as soon as possible.