I used to do dungeon runs all the time and would be assigned to a group within 5mins at most, but since the update I cannot find a single group using the matchmaking. I'm queued for hours without a single match and even unqueueing and requeueing won't change that. Additionally, I noticed a bug when I press 'queue', even when I just log on for the first time during the day, it would tell me 'you've queued too soon' or something along those lines and would make me queue for the queue... which would usually be 15mins before I could enter the regular queue again.
Has something changed in the way matchmaking works?