Chosen Solution
The left side of my headphones work, but when I push the plug/audio jack of my headphones while holding it both of the sides work. Does anyone knows how to fix this?
Not exactly sure how to fix this but it sounds like the plug has worn out. I have had this issue happen on a number of headphones that I owned. I have always just replaced them but you could try replacing the cord if you feel you have the skills to do so.