Contact customer support, as far as I can tell it's a minor hardware issue that is trigger by some power saving feature, if it's under warranty, they will have you do troubleshooting and all of that to make sure it is a hardware issue but ultimately will
offer to replace it. I just shipped mine in for a replacement after that. It seems to be a not totally uncommon issue obviously we wouldn't all be here if it was, but it's not purely software because not everyone is encountering the issue.
There seem to be some workarounds, but if you are having this issue, it is faulty hardware as far as customer support is concerned and you should have it replaced. How or why it is happening is on microsoft to figure out internally. And hopefully when they
do they will issue a recall for affected units. Until then, if you have this issue, take advantage of your warranty, in my experience they are willing to accommodate, even if it required some persistence.