My Iphone 3G keeps going into Recovery mode, How do I stop it from doing this?

Basically I have had this iphone for a while now and it has never had any problems until a month ago. It has started just switching off and to turn it on I had to hold in the circle button and the one at the top for a while before it would turn back on. Now it VERY rarely even turns on anymore. When I plug it into itunes (when my phone is off and I can't get it back on) it tells me it has detected an iphone in recovery mode and says I must restore it. I've done this FOUR TIMES and it is still going into recovery mode afterwards and only ever turns on if I leave it charging for like 5 hours even though it turned off on almost full battery? After restoring it then it will work for about a day and then go back into recovery mode… It is not jailbroken and I just can't find a fix for it. At first it turned on quite easily with the 2 button method I described but over a period of about 3 weeks it became more and more unbearable and took more attempts of holding it in before it would turn on. As far as I know my itunes is up to date, Please Help

Added (1). I need an answer to this problem, This is my personal phone with all my things and I need it for everyday use, I can't just whip up a new phone just like that… So please don't just tell me to buy a new one.

Your phone is shot. Time for an upgrade. Its 2012 get with the program

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