i am have been using iphone 3GS, 4 and now the 4S and has gone through every iteration of the iOS but none had give me this problem.
the problem is intermitten: when i open contacts.app which was already running in the multitasking bar and the app will freeze when it is open. sometimes when it is a little better, it will freeze when i try to edit a contact info - i will press edit and tap on the email field and boom! freeze.
Initially it is only my contacts.app, now it is spreading to my messages.app
i made sure i close all my applications in the multitasking and it still happens intermittenly, so i believe it is not crashing due to insufficient memory - i think it is not even a memory issue as it does not crash, it freeze..
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