just to be clear for everyone. There are many things that may look to the users that they are resetting the phone but they are different. (resting from within the phone menus is not the same as hooking it up to iTunes)
I am not saying resetting or updating. I know it may be confusing.
The steps i took to fix problem.
1 backup to icloud via wfi.
2 hook up phone to computer with lightning cable
3 have itunes download a clean full version of the current ios.
4 do a full restore. it takes like an hour for it to load and run though everything.
5 once done get on your wifi and sign into your accounts (icloud) and download all your backed up data (2 hours for me)
if all that does not fix the problem, (it did for me iphone 7 plus 256 ATT) then i would go to an apple store, set up an appointment. there is nothing else the user can do to try and fix it.
good luck guys