Samsung A5 blinking problem

[aim5000]

Hi,
Since I bought my new Samsung A5 it starts blinking as someone press on both two buttons under the screen (Tab and Back), and it keeps blinking until i press on side button on my right hand where the screen goes off, but sometimes when i press on the button again it gets back blinking again and then have to press the side button for several times till it solved.
Video available

 

[B. Diddy]

Welcome to Android Central! Sorry, but what's blinking? The screen? The buttons? What is it about the two buttons at the bottom (it's Recent Apps and Back, by the way)--does the blinking happen only if you press both of those buttons together?

 

[Natalia Khalifa]

Hi

Can you help me out there?

I've just bought an A5 and its battery is draining too fast. I've set the brightness to the minimum and also disable the back-light and remove all unnecessary applications and also modified the setting with more restriction, BUT STILL IT IS SHOWING 55% SCREEN USAGE...is this NORMAL?

I would really appreciate for some help.

 

[aim5000]

I am trying to post video link to show you the blinking issue, but it did not works. I have been advised to re-install the A5 software, I wonder if you could help me to make a proper backup for my mobile and then move throw-out steps to solve the issue.