I think some ppl go afk because as soon as they begin combat, the game freezes. Of course, logging off and restarting game - this is not possible because of all the delays, and the 10 minute event is over by then. Of course no credit is given to complete daily.
I have experienced that if you just wait for the game to respond on it's own time, about 15 mins, you can complete the daily, but the reward chest is no longer present to be picked up.