This problem happens for most people due to how Sony designed their controller. Sometimes when you are pushing the joysticks down, your controller will activate random buttons when you didn't push them. This is a simple easy fix that almost anyone can do. I hope this helps some people out because this problem happens to me with almost all my controllers over time.
Things you will need:-Screw driver
-Piece of paper
-Tape
Time to complete-About 5-10min.
Difficulty-1/5
How to Fix PS3 Controller Joysticks Pressing Random Buttons