xbox one x controller loosing sync after complete shutdown or in energy-saving mode

Short story: Went to the store, talked to a microsoft rep, did a WIRED USB firmware update to the controller and the issue went away.

Long story: The store didn't want to take back my sytem under warranty because SOMEONE screwed up about... or SOMEHOW... the serial number of the box differed from that of the console by 1 number! I was there 1 and a half hours in the store. I kept my cool
(I didn't swapped the box for another system -angry face-) and did the only other option available to me: talk to a microsoft rep. First, I Iost another 20 minutes figuring out how to talk to a person. The number the store manager gave me only had instructions
to go to the xbox.com/help and nothing else. So I went there, logged on to my account and choose the option "my controller isn't working" and follow the steps in the troubleshooter. The troubleshooter advised me to send back to microsoft the controller (which
at the time I thought wasn't the case because a controller from another friend had the same issues with my console and had decided that the problem was the console, not the controller) So the store manager then told me not to choose that option ("my controller
isn't working") and choose instead "service, warranty and repair" (or something like that) I then placed my submission to receive a call back from microsoft. I waited for about 5 minutes and got the call. The technician advised me to update the controller,
but I was... what? (because I previously had assured to update both the system and the controller) BUT THIS TIME, he told me to update the controller with an USB cable. And I was... what could be the difference? Moral of the story... IF YOU EVER UPDATE THE
CONTROLLER, DO NOT DO SO WIRELESSLY, ALWAYS UPDATE WITH A USB CABLE.

Please someone mark this answer as the solution to the initial question (I can't mark my own answer as the solution).

Hi neyuru

Controller disconnection issues can also be caused by wireless interference

I had a massive issue with this but managed to solve it by just moving my cellphone to another location while gaming

Also there was a firmware update released recently which made it much better

I managed to borrow another controller and the problem still persisted. I also soft reset the console and also to default factory settings. None of this worked. I am going to return the console to the store.

Thank you for taking the time to let us know what worked for you, neyuru.

As you have mentioned you have found a resolution to this, we will now be locking this thread, and marking you as answered as requested.

If you have any other questions or concerns that differ from this matter, please, feel free to create a new thread and we will cater to you there.

Thank you for being part of the Xbox Family and we wish you a wonderful day!

I talked to a friend, unfortunately she's on a different city. But she did managed to repeat the issue. Although she recalls having the same problem a while ago, she doesn't bother anymore with the issue because she has the system in "instant-mode".

This seems to be a general problem (I have seen similar posts in the span of over 4 years) that not only affects xbox one x, but the xbox one s and the original one too. I also noticed that the issue happens even when the controller is connected wired or
wirelessly to the console.