I have had one game where I disconnected from the server because XBox Live went down on my console for a minute or so. Got rebooted and back into the program in time to not see the game on the schedule tab at first, and have it show up about a minute or so later as a concede.
I had the game crash after a fairly complicated turn 16 beastman touchdown. I don't remember for sure, I think it would have been a game ender, but, it is possible I would have to kick off once more. It crashed during the touchdown celebration. The beastman yelling and dancing and he looks at the screen and durdurdurdurdurdurdurdurdurdurdurdurdurdurdurdurdurdurdurdurdurdurdurdurdurdurdurdurdurdurdurdurdurdurdur, and desktop.
I had a game crash during the first half of a game. I don't remember the team or specifics, but the typical Xbox crash I described above, that happens on many different games on Xbox, but the durdurdurdurdurdurdurdurdurdurdurdurdurdurdurdurdurdurdurdurdurdurdurdurdurdur, and then desktop.
I had a game that failed to load after the inducements screen. Not the above, it just stayed on the pre match loading screen until my opponent asked if I had conceded. This was an FABBL premiership game, not on the CCL, so we had an admin reset it.
Hope any of this helps. Unfortunately, at least the two CTD instances I've had do happen on other games on my Xbox, Skyrim/Fallout4/Witcher3/XCOM/XCOM2, among others. Almost identical. The durdurdur noise for about 8-10 seconds, then silence, then briefly black screen then desktop.