Most of the time you can tell the difference between a quitter and a bug. Not always though.
Had 2 crashes on iPad due to the chat system that crashes when your time limit reaches 0. And since you can't save the message for next shot, it's a bit hard to finish you sentence at times...
9 holers quitters are the most annoying, they play till the last putt and forfeit there, stripping you of over 100Xps.
The other cumbersome forfeit is the reconnect one that is almost 2 minutes long. That's a hell of a long wait and almost never ends up in the game resuming. I think it only happened 5 times (maybe less) in 50 iterations that the game actually resumed.
That's life.