IPhone cuts out unexpectedly

My iPhone 3Gs has started cutting out on its own - Not straight away, either when i lock the phone or if i open an app, it did this when i opened the camera app.
When SIM NOT installed - not charging - works fine
When SIM NOT installed - charging - works fine
When SIM INSTALLED - not charging - cuts out on different occasions
When SIM INSTALLED - CHARGING - works fine
So looking at the list above its seems to only cut out when sim in and its running on battery power.
When the phone cuts off it has thick black lines down the screen, i press the power button to reset the phone AND IT DOES BOOT BACK INTO IOS5 but does take a lot longer than usual.
Has anyone ever had this type of issue?

Hi Ben,
It definitely sounds like an over-heating issue from your description although I would expect it to recover much more quickly than 7-10 hours. You could try the technique of vacuuming the dust out of the air intake grilles to see if this improves the situation. Also check that the fans do work correctly and that there is enough space around the unit when it is in use.
regards,

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