Matchmaking broken? Keeps resetting to "off"

Hi all! COTW noob coming in fresh to the slaughter from last weeks sale.
I've managed to get one ranked online match going, but apart from that my matchmaking seems to be borked somehow.

I turn on search for both ranked and casual games, but after a while I hear a suspicious "ding" sound and the "ranked" and "casual" toggles in Fight hub gets turned off.
Is this some sort of message telling me I have a connection problem with the matchmaking service or what?