Crashes repeatedly, often losing part of your progress in the process. Even when it doesn't crash, it often loses part of your progress when you quit - has repeatedly screwed me out of timed events by losing my progress right at the end. Most recently I won the second quidditch cup, and when I quit and returned, it went back to showing me the celebration for winning...but recorded my progress as losing the cup!! Edit: Tried steps recommended, still losing my progress regularly.