The Xbox kept losing wifi connection sporadically. At boot up. So I kept rebooting it until it connected. Very random. When the wifi was down, it wouldn't even see my neighbor's wifi. So I suspected the wifi card was bad. Sometimes it worked, sometimes it didn't.
The repair was easy using the guide. I did want to clarify one point in the guide that was confusing. I'll go back and make a comment.
This was a great experience. I didn't want to buy another xbox one for a bad wifi card.