The message spamming thing is due to it lagging and crashing, you probably just pushed a key a few times because of lack of responsivity - don't worry about that spamming message, it's not unusual to see that when the game is lagging and about to crash, it doesn't mean that you have done anything wrong, and it doesn't refer to you sending messages.
The issues with crashing/rollbacks in Wrothgar are being investigated.