Chris, when I played in the Wack N Hack elite Open and finished round 2, I got the same message, saying that my stats were not submitted and that I would have to resubmit them when I logged in the next time. However, before I backed out of the game, I checked the leaderboard which showed my 2nd round total score up on the board.
Then when I logged in next time, the game asked me if I wanted to resubmit my stats and I clicked yes just to see what it would do. Of course it replied "Unable to submit stats. Do you want to try again?" So I did a few more times, but got the same reply.
So I clicked on NO and it told me that I would be disqualified from the tournament. But I had no other choice but to take the chance, so I clicked ok and went on into the game screen. It showed that I had not played round 2 yet, even though I did, so I clicked on start game and it took me right to round 3 where I was really supposed to be. So I didn't really lose anything and I figured it to be just a glitch. That's the only time this has happened to me so far when I play in a tourney.
I hope this info helps.