Black screen issue, read

A

AC Question

I've had my note 4 for one year now, I used to be so happy with it until a few months ago, where my battery started dying at 20,30 or even 40%, my phone used to show a block sign on the upper, right side, lag, and then turn off, whenever I restarted my phone, the battery would be low, so I changed my battery and here comes the problem,
My phone shows a black screen suddenly whenever I use some applications - snapchat mainly, or screenshot anything.. It will not turn on unless I remove the battery and put it back.. whenever I restart the app (snapchat), it would turn off again :/
What should I do?
Note: the phone heats up during this.
Another issue is that I have something printed on the screen, like a pale screen (a keyboard and a facebook page), it's too pale and can't be noticed but it bothers me :/
 

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