Galaxy S6 :: Why Phone Shut Itself Down And Screen Flickers

I recently bought a Samsung Galaxy S6, but I'm not satisfied with this purchase.

In fact, the smartphone, from the beginning, showed different annoying problems, like:

- It shuts down randomly, when I press the home button to turn on the screen. Before it shuts down, the screen shows some weird horizontal grey lines for a couple of seconds;

- When I surf on the internet with Google Chrome, often the screen shows strange colorful flickerings, making it impossible to do research on Google

- The screen randomly becomes pink, and I have to change the brightness level in order to fix it.