Hi I have had this same issue for the last few days and I found a way to fix it. The vertical axis sensor was malfunctioning on my left analog stick causing forward ghosting with the L2 button and interrupting all of my casts. I replaced it with a sensor from an old xbox 360 controller and it works fine again. It can be a process if you're not used to repairing your own controllers.

This video: https://www.youtube.com/watch?v=4AkDIzKqmYY
and this guide: https://www.ifixit.com/Guide/Disasse...Assembly/22679

helped me get through the repair in less than an hour. Good luck to anyone else experiencing this.