If your Xbox Series controller is making your game character do things you did not tell it to do, you're probably suffering from a common issue known as "drift." It's not the most fun problem to rectify, but there are some things you can do to make it better.
Stick drift can affect any controller of any brand or type. It presents as input from the controller that wasn't made by you, the player. In other words, your sticks may be in the neutral position, but the game still detects input. This can cause things like the in-game camera constantly spinning, or a character walking forward all the time.
While you can manually counteract drift with your thumbs on the sticks, it's a miserable way to play and in most cases makes a game unplayable. Stick drift happens because something has fouled or otherwise damaged the mechanism in the joystick that reports the stick position to the console. Most controllers today use a wiper mechanism where a contact moves along a conductive rail in each axis, and determines position based on the amount of resistance in the material. This mechanical movement will eventually wear out the mechanism, making it less precise. Any material that affects the conductivity of the mechanism will also cause issues, such as false readings of input.
Opening up an Xbox Series controller is not complicated, and you can do it with a common set of Torx screwdrivers. The TR6 and TR8 should be all you need to get the job done. Having something like the iFixit Torx Precision Screwdriver set will always be handy, even if it costs a few bucks now.
While it's not hard to open up a Series S | X controller, you should not do it while the controller is still under warranty. If your controller has started drifting while still under warranty, you should send it back for free repair or replacement. As long as the drifting issue is not caused by abuse, you should be in the clear.
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