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Original post by: Brian Wood ,


In my experience, it's 1 of 2 things.

1.  I have seen bad batteries cause this, because they can't supply the proper amount of power consistently.

I would replace the battery.  Here is the iFixit guide [guide|29424].

2.  It could be a bad NAND flash (your iPhone's hard drive).  There are services out there to reflow the NAND chip, however I have never used them.

I have had the exact issue you explained and 9 times out of 10 it's one of these two.  Hopefully for your sake, it's number 1.  Let me know, if you have any other questions.