Defective Controller

I have two defective controllers and it makes Absolutely Zero sense to purchase another controller that becomes defective because of Microsoft.

You should try to follow these steps:

https://support.xbox.com/en-US/xbox-one/accessories/wireless-controller-broken-wont-work

and open a repair request if necessary.

It will be the sensor in the analogue that will be loose, ive encountered it a few times, with FPS games you can adjust the deadzone on your right analogue to counter the drift.

The larger the deadzone the greater input you have to input for it to register the movement, ie if its only slight drift it should eliviate it.

There are people on ebay who will replace or refurbish the controller as the sensor is roughly about £20 for example if you are in the uk.

There are plenty of tutorials online, but id highly recommend buying the security star keys if you wish to replace it yourself.

Hi, phone xbox support, and they will be able to book it in for repair for you.

You won't. You just get an address and reference number to put on the outside of the package. You'll need to pay for shipping. Make sure you use a shipping method with a tracking number.