I vote for mostly shoddy development.
Alex already hit the nail on the head with his list of reasons.
#3 bites a lot of iOS newcomers who are new to not having Garbage Collection.
From my personal development experience for iOS, all my crashes have been traceable to specific bugs in my code and not to any mysterious OS bogies.
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64 GB iPad 2 WiFi, Apple TV 2, 32 GB iPhone 4
Early 2011 MacBook Pro 13" (dual boot with Windows 7), Early 2009 Mac Mini
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