Well, i’d like to go out with some guile-esque sunglasses pose by saying I’ve found the actual cause of the problem
The SE stick’s start button PCB board is screwed in between two clamp-like holders
The PCB board is actually smaller than the gap that holds it, meaning that the board gets pushed back from the buttons, which makes the gap for the start/end button larger.
This means that the buttons barely make contact and the way I used to hit the buttons would push the board back; this is a design flaw :\
Here’s the design
grey: pads on the start/end
I’m happy now, believe me