Why is my screen flickering?

Why is my screen flickering?

Hi! I got my Nikon Coolpix S33 somewhere in 2017, and it worked great… until now… What’s happening? I think my gallery button isn’t working (actually, I can’t get into my gallery on the device!). So that button clicks itself, opens gallery very often and interrupts the shooting experience. That’s my assumption. I’m also providing a video, so check it out :) The camera also turns on by itself (as shown in the video).