Anyone with experience fixing sega controllers or controllers in general?

[CPearson87 | 4]

Hello all, in the middle of playing symphony of the night on the saturn, the game started randomly pausing without touching the start button. I noticed when restarting the system, that the controller is either rapidly pressing the start button, or holding it down on its own. Even when I took apart the controller and plugged it in without the pads to press the contacts, it was still doing the same thing. Any help on what could be the problem would be very much appreciated! It is the official australian model 2 controller that has turbo switches on the back, thank you.

[PII | 1,883]

Sounds similar to issues I've run into when a wire is broken or frayed.  Many times when testing a controller I've witnessed spontaneous input like you've described...