Question [HELP NEEDED] Nexus 7 (2012) Screen Distortion

Hi,

This problem has been going months now. And it's getting worse. Before, it was just happening when I open games that use Internet connections. However, this time, even if it's just opening the lock screen the distortion problem appears. Any help, please?

Links to videos of the screen problem below:

Months before
https://www.youtube.com/watch?v=VVKhpII6MwY

Happening now
https://www.youtube.com/watch?v=XWNleEjl6-g