IPhone 3Gs rebooting itself now stuck on boot

Question

Hello,
I've had my iPhone 3Gs since February 2010 making it as of this post 1 year old and 3 months over warrantee. Last week my iPhone started randomly turning off and on again and it was happening a few times each day. It began to reboot itself more frequently, to the point where I couldn't use the phone because it would turn off mid text-message and during phone calls. I grew frustrated and decided to put it into recovery mode to restore the phone, as people on these discussion threads recommended with no luck, it was giving me an error code 29 right when it got to the part to upgrade the firmware (I believe it didn't make it to this point because the phone would turn off). I tried this several times when finally it worked! I restored my iPhone and loaded the backup I had made and charged the phone up and went about my day. As the battery drained it turned on and off more frequently and then went from 30% to 3%. It now will not charge whatsoever on the charger, or through my MacBookPro. It will not boot up at all, but flashes the apple logo then turns black and it keeps doing this over and over. Itunes won't even recognize the iPhone as being connected to my computer.
I don't know what to do. I have never jailbroken this iPhone or tampered with it in any way, and I'm very disappointed that this product is showing such huge issues after only a year of use. Right now my iPhone is completely unusable and I'm hoping that somebody has an answer for me to fix this.

Answer 1

On My iPhone 3GS started with iOS 4.3 and 5.0 did not improve even with the 5.0.1. When started, the device shut down at around 43% battery. Every 2 or 3 weeks the problem got worse ... 53%, 65%, 75%, 86%, 96%, 98% and 100% now it can be turned off.
I realized that if I use the internet through the 3G off at around 98%. If you use the internet through wi-fi, off at around 86%. If you use 3D games off even faster. The first shutdown can be restored by resetting the system (home + power). But after the second or third, it asks to connect to an electrical outlet, the battery even when it was full. If you make a small charge, enough to start the system will turn off at the next mark (percentages cited above). I started using the iPhone always connected to an electrical outlet (house or car).
Recently I made a painful test: I turned off the 3G, wifi and data transmission; stopped to use all the features of the iPhone, except for calls and SMS. The GPS was on, but I did not use any application that needed it. As a result, the battery lasted about 4 days and declined up to 6% (when it fell during a call). I was very glad to review the battery alerts (20% and 10%) after so many months. Then I waited 1 or 2 hours and recharged the phone to 100%. I noticed that charging was much slower than what was occurring before (and remains so since then). But until now I did not notice a difference in the problem.
Other users with the same problem say revert to factory settings did not fix the problem. There are no Apple Stores in my country, only representatives and mobile phone carriers, but the assurance of my iPhone expired in May 2011, in addition, here we have the iPhone 4S world's most expensive (between US$ 1419 and US $ 1,855), the which means buying another iPhone is a last option. Buy another battery would be easier, but I question: if the problem is the battery, why work properly when does not was required 3G, Internet, games or gps?
It would be nice if Apple responded something like "we are aware of the problem and are working on it." At least we could hope to keep until the next update.
Here are some of the topics of people with the (same / similar) problems:
- https://discussions.apple.com/message/16862278#16862278
- https://discussions.apple.com/message/17076909#17076909
- https://discussions.apple.com/message/17169026#17169026