Help boot problem

I have a samsung galaxy s3 with some stuff stored on the phone I want to get back. Some data wasn't on the card. When this happened the first time I put my cellphone down and next time I checked it automatically turned off. When I noticed this I tired to turn on my phone again and it booted perfectly. New minutes later it turned off on me again. As time went on the phone started to die faster and faster to the point now it shows the galaxy picture on boot up then instantly turns off. I tried switching out batteries but I ran into the same issue. My two guesses is it has something to do with boot loop or the connector on the phone and the battery went bad. But if it was a boot loop it wouldnt of booted up correctly first and second times. Any clue? If its possible I would like to order the part I need and repair the phone myself. Thanks for your time.
 

joe71

Android Expert
This was one of the problems i had with my galaxy s3, for several hours one day it got stuck in boot mode, it was trying to load but couldn't process, i had to restart the device multiple times, before it clear. Hopefully by trying a restart a few times it clears
 
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