I recently began having this issue where the controller turns itself off after being on and connected for 3-4 seconds and I have had this controller for 4 months now. I don't think it's a battery issue but the controller works fine when it's being plugged in (USB).
I have tried updating the firmware using the Xbox accessories app but it says I am not assigned and I need to plug it in to configure the controller.
Can this be solved? Thanks!