they just implemented new matchmaking system. let them work on it. i only got that once but it was players fault. if there is like 1 player missing to start the match dont be inpatient.
i had a match where we would miss like 2 or 1 guy and constantly someone left . if the ppl would have just stayed in the match. it would have started. there was allways ppl joining but also ppl leaving it was ridiculous