Oh my God, I'm really sorry to hear that. That kind of thing is something that's out of my control though since it's to do with the app engine and perhaps even how your particular phone handles opening up apps and background apps. This is the first I've ever heard of this happening so I pretty much concluded that that notification wasn't problematic.
I really couldn't tell you why it wiped all your auto-saves like that. I'll add in some hard-save reminders throughout and before that notification to future proof this from happening.