Why isn't my SteelSeries Stratus XL controller working properly?

I got a SteelSeries Stratus XL controller to play games on my PC.

At first it worked all right. I paired it through my Insignia Bluetooth and I was ready to go.

Then the next day I couldn’t play properly. My character kept firing even though I wasn’t pressing the fire button. I kept resetting the controller but some issue always came up. Either I kept walking without moving the joystick or I kept firing without pressing fire. Sometimes after resetting I’d be okay if I walked around without pressing anything, but then when I started pressing buttons my character would just keep firing.

I updated the firmware on the controller. I even updated the Insignia Bluetooth driver to make sure it’s for Windows 10. I’ve unpaired and paired the controller countless times. This is really fucking annoying and I don’t know what’s wrong. Trying to look up useful information on this is aggravating so I resorted to Fluther.