Unknown error 40 iphone 4s

Hope anyone could help me with this..theres a problem on my iphone4s. everytime that i left my iphone4s in a cold place..it always been overheating i think? then sunddenly it will shut down. then when i try to turn it on.. it takes 1 to 2hrs of waiting to open, den when it opens the battery was drained then i need to charge it…and after doing some restore, theres an error pop up. booom unknown error 40. i already followed the instruction in the mac forums. but nothing happens. some people told me that its a hardware problem..dont really know what to do… hope you guys could help me.. any help will be appreciated.. thanks!

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