After more research on matchmaking and still receiving reports from players, we have decided to look at matchmaking again.
The result of that research is that scene loading was being interrupted by our exception timer, which actually should function as the tool that's saving you from being stuck. Well, it wasn't in this case, so we've corrected that.
Our apologies to the fellow Rumblers who have experienced this issue. We hope this is the final fixing iteration on matchmaking.
FIXES