Dungeon Queue Serious Bug

Queued for a heroic dungeon, queue popped, I was in org and was then sent to Dalaran and figured okay just need to right-click the dungeon icon and teleport into the dungeon. Loaded into a frozen screen. Couldn't type, interact with anything on the screen, and couldn't log out/exit the game. Have to Alt+f4 and log back into "character name already exists" and tried the unstuck via the website, now I'm in the same problem again and have to wait 30 minutes to use unstuck. Can't log in at all now. Playing on Frostmourne server

you have triggered "too many instance" limit.
So you had to wait 30/60 min before to try entering into a dungeon again.