Recently Got a new series x from Microsoft repairs.

Got notification today my Xbox Series X has been repaired and is shipping back tomorrow.

Hopefully, they have included what the repair was when it is returned.

Sent mine in for repair as it was still under warranty. Was sent a new series x, no problems with MW2 now thankfully!

I got my Series X in January, and never even took the included controller out of the box, because I own the Elite Series 2. When I dropped my Elite Series 2 (oof) recently, I sent it off for out-of-warranty repair, and pulled out the basic controller, still wrapped and taped in the foam bag in the box.

Stock controller worked fine for a few days, then there was a firmware update - recently, and I'm having intermittent disconnections all the time. It works fine when wired with a USB-A -> USB-C cable (I use the 9-foot one that comes with the Elite Series 2).

I decided, since I'd never had trouble with connectivity on the Elite Series 2, that I would buy a 2nd one, brand new of course. It 100% required me to update before proceeding.

Since I never had issues with the Series X and Elite Series 2, I wasn't aware of the known connectivity issues until the basic controller started intermittently dropping connection.. After searching, I saw that there were a ton of articles from way back in January, including Microsoft acknowledging the problem and releasing a firmware update in March...

Yet here I am with a freshly unwrapped Series X controller AND a brand new, (delivered Sept. 7th) SECOND $180 Elite Series 2 controller, and BOTH are cutting out intermittently..

-Sitting Less than 7 feet from my console

-I keep my batteries charged - both the Elite's internal, and the Enelooph Pro AA rechargeables that I use in the regular controller.

-As I mentioned, latest firmware on controller

-Of course, latest firmware/software on Series X console

-Both controllers work fine when wired.

-Already performed hard power cycle on the controller as well as the console.

-1st Elite (the one being repaired) never had issues until I dropped it - but it was never exposed to that new firmware)

-That's 8 months I used my 1st Elite Series 2 with the Series X and no problems.

It seems to me that the original intermittent connectivity issues were never resolved.

microsoft did announce (from what i got told) that they will be making all xbox games available on the xbox series x

If the problem persists even after trying everything from the article above

Sadly your console needs to be inspected and repaired in the closest authorized retailer or where original parts are used
(Microsoft only offers now their repair service to Xbox Series X/S consoles)