4) Don't disconnect during queue. Seriously, there is minimal communication during queue, there should not be anything that's so inrecoverable that you need to boot out players from the game. Make effort to recover, instead of just giving an error.

5) If disonnected during queue, do not close the game. Before you press "Start" in the main menu, the client is not connected to the servers. So the main menu CAN handle a not connected state, why not just send the players back to that screen? Why do they have to go through that chore of a log in again?

6) If disconnected from queue, have grace period, that's longer than 30 seconds. When met with 3 hours of queue, people wont be looking at the game every second. They might go take a shower, eat dinner, watch something. Disconnects during this period is 99% of the game's fault, so dont punish the players for it. Have grace period for 5 minutes, or longer. Consoles dont even receive grace period, because of slower loading times, they cant get in the queue quick enough. It is(or at least, should be) just a number to set, so please set it higher.

7) If disconnected from the game (from whatever reason), have a grace period of at least 5 minutes. If the player reconnects during that period, have a priority queue for them. Nothing worse than raiding, game crashes (which is again, the developers fault, not the players, dont punish them for it), and met with a 3 hours queue. Most of the games have this, there is 0 reason for you not to have it.

That's all what I can think of, but if I can think of these as a player, you could probably think better solutions to at least easen the burden and the frustration of the players.
Again, these solutions do not require hardware, most of them do not even require server change, just client and launcher code changes. Please do not abandon the gamers, because eventually they will have enough, and leave your game. Every time you release a new content, the more and more frustration we get. How many releases do you want to get overshadowed by login issues? Please take time to fix these issues!

Apologies if this is the wrong section, but Feedback section somehow has only sub-section of feedback about website, not about the game. Why is that?