Because OCing is not natural, its a "hack". If you don't do it properly or go higher then the CPU can take it will either become unstable (like your experiancing) or completly fry... try down clocking, you might be higher then the limit...
I would buy a new fan if yours broke, it probably was a POS quality one...
I don't CPU OC so if you want better knowledge on it your gonna have to wait till someone who has more experiance with CPU OCing replies.
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