Oh, the many woes of being an early adopter in the Beta software world. The software might crash, causing you to lose all your work! It may have gaping security issues, leaving an entry way for malicious misdoers! It may start your stuff on fire! Wait, what?
According to developer Gus Pinto (who sum ups his life in under 140 characters as “Pioneering Mac Desktop Virtualization. iOS, Mac & Android Development”), that last bit is exactly what happened to his iPhone 4 running a Developer Beta build of iOS 5.