I have just been given an extra loss in the most recent Sealed event (Jeskai Tarkir: Dragonstorm) on PC.
When I opened the game, I was at 4 wins: 2 losses. I went to get my pizza out of the oven. I came back and was at 4 wins: 3 losses with no option to start another game - just the normal Claim rewards button - I had not started another game! I would have heard if another game had started.
Really confused about this.