The Xbox One Wireless Controller is designed for a long life. In the rare instance that one of your controller buttons doesn't respond correctly or at all, check whether the issue you're experiencing happens in all your experiences or just in one particular game. If you're only having the issue in one game, there may be an issue with that game. Visit the game's help page to troubleshoot (this may be a third-party site). But if the issue happens whenever you use the controller, the controller needs to be replaced.
Note If your controller buttons react incorrectly, your controller was probably reconfigured by another user. For example, when you press a button, a different button responds. Find out how to remap your buttons at Customise a standard Xbox One Wireless Controller with the Xbox Accessories app.
If you're using an Xbox Elite Wireless Controller and the problem is with a removable part, follow these steps to determine if you need to replace the controller:
If you've tried these steps and the Elite controller still doesn't respond, replace the controller. If other parts of the controller work but one particular removable part doesn't, contact Xbox support for a replacement.
Go to the Xbox Online Service Centre to request a replacement Xbox Elite Wireless Controller.
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