If you look at Settings->About->Diagnostics data (or something close) - you will see a sizable list of crashed programs and OS components.
Is that enough "evidence" for you? :) (I actually hated writing this to be honest - never understand what reason people have to doubt universally accepted things like crashing software!)
Plus if you have so much trouble with you phone, what about calling Apple and telling them your issue. When I called last time because a failure they send me immediately a brand new device. Sorry mate but something seems odd.
I don't want to attack you personal, it just seems that a lot of people are trying to talk BS about Apple products.
vs
When I called last time because a failure they send me immediately a brand new device.
'Last time' seems to indicate that you come across a number of failures. Which particular device are you talking about here?