Galaxy S3 keeps freezing even after factory reset!

A

AC Question

I have my Samsung Galaxy S3 for 2 years now. In the last couple of weeks it started randomly freezing and not responding to anything but a long press on its side button or take the battery out.
Today I tried for the first time a factory reset, thinking that it would solve the problem and it would run smoothly again. It didn't, nothing's changed.
I don't know what to do, it's very annoying because it does this quite often. What could be the problem? :(
 

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