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.

How to download full movies to my iPhone 4 for free?

I just have a question about how to download free full movies for iPhone. All I want to know is if there's an app or website for iPhone that will allow me to download movies directly to my iPhone or to my computer and then transfer it to my iPhone using iTunes? And, either an app or the website, what are the steps to download the movies I want from the source you guys suggest me?
I will really appreciate you response

Why won't youtube load on my iphone?

I have an iPhone 4s and for the past couple of days I go onto my youtube app to look at a video but it never loads. I have perfect service and sometimes I'm connected to a router which has perfect service so what's going on here?

No sound in apps in iphone 3g?

My iphone was working fine just 2 hours back but now it is not. There's no sound in apps and no lock sound, no key tone. However videos and mp3s are working fine Also no ringtone when call comes. What to do? Please give a solid cure

Early AT&T upgrade fee for iPhone?

The problem is that every time the new iPhone comes out I'm 1 year in the contract so I don't qualify for a $200 iPhone. The last time I think I payed like $450 for the 16 gb iPhone and renewed the contract. How much money on top of the $200 for the phone do I have to pay like for an early upgrade?

What really are the advantages of Android over iPhone?

I have HtC One X and although I really like it, I can't see why it is better than iPhones aside on it being cheaper to buy. I had iPhone before and I wanted to try Android and so far, I'm glad I did but I really can't see why people get them over iPhone. True I love the screen size of the One X, but it doesn't do anything better than what my dads 4S can do.Am I missing the point? What are the advantages of Android over iPhone?

Difference Between IPOD and IPHONE?

Few questions… First like the question says, What is the difference between an IPod and an IPhone?
Another thing how are either innovative? I can see when the IPod first came out but it helped instead of carrying CDs, you can have it all in one stored device. GREAT! But how is this IPhone innovative? How does it improve someone's life?