iphone 4 randomly freezes what hardware to swap

iphone 4 randomly freezes - what hardware to swap
location: apple.com - date: May 23, 2013
Good Afternoon, ive recently started up my own business fixing mobile phones - mostly cracked screens and chassis replacements. Just recently i thought id got a bargain on ebay regarding an iphone 4. It was described as working correctly, can make / receive calls and send texts etc but randomly locks up. Ive got the phone today, unfortunately its locked to the 3 network so ive got a micro sim on the way so I cant actually proceed further at this point.  Although it did crash once on me when i tried to select language's etc - had to hold the home and power button down until it turned off. Ive read on the forums that this is a common fault, and can occur to any iphone - faulty or otherwise.  And
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