OK so before I start explaining the fix. Let me first start by saying that I followed all and any solutions that was out on the web in terms of turn off this setting and turn this on and log in/out of this and etc. Nothing worked!!!! So I was able to finally get a really good expert person at Apple with 11+ years experience. This issue is related to anyone that may have done a transfer from iPhone to iPhone. The issue is that when backed up its pulling in corruption and causing the FaceTime to work properly. Good news / bad news is: Good news, there is a fix. The fix is to reset your phone and wipe the phone completely. When you restart the phone install as a new setup and not from a backup. The bad news is that you have to set it up as a new clean install and will need to re-download most of your apps. There are some apps that are standard that will pull just simply from cloud and things like your contact list and etc. I tested FaceTime on new install and it worked without any issues. It sucks because I have a lot backed up and now I had to reinstall a lot of my old apps and settings but it will ensure you have a clean backup moving forward and not a corrupt. Let me know how it goes for those that have had the same issue with FaceTime like I did (where wifi would drop as soon as it connected).