My S3 randomly shuts off, LED continues flashing. How can I fix it?

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AC Question

S3 randomly shuts off, LED continues flashing.

I bought the phone second hand about 4 months ago, and after 2 months it would randomly shut down maybe once or twice a day. It would happen even while charging (green LED would be stuck on if it happened while charging), and even while not being used. This happened for a while then suddenly stopped happening.

2 more months passed and now it's happening again but this time worse, happens about 5 or more times per day, when using it or when its idle. The LED continues flashing as if I have a notification but the lock key doesn't turn it on until I hold it for 5 seconds to force restart.

I've tried restoring to factory settings but didn't help. Anyone have any other ideas? Personally I don't think it is the battery because otherwise the LED wouldn't keep flashing right?

Samsung S3
Android 4.3
Kernel 3.0.31
 
Hmm, it looks very complicated, I'm a bit of a newbie at phones. Is there anything else I can try before doing that?
 

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