Back it up in iTunes. Right click on the back-up and click Archive.
Wipe your phone clean and restore the back up.
Please see if that helps.
If not, do it without restoring from the back up and reinstall your app one at a time to see what's causing your issue.
Don't forget to post back to let us know how it went.
I think you may be right, I had a similar issue with my 7plus and after trying everything here - up to getting a replacement the only thing that (fingers crossed) that worked was erasing my old iCloud backup and turning it off for a few days (usually do encrypted backups on iTunes anyway) then starting fresh. Maybe an issue with a pre-AFS iCloud backup?I had this a LOT with the AFS update. My issue was when my phone was in one location it crashed when it was connected to WIFI only. It was very strange. I'm working around it but wiping network settings and connecting to WIFI and NOT resetting the phone. If i restart the phone, it would crash when connected to WIFI in this one location. Very strange issue. I hope you get yours resolved - post back if you do. I'm sure it was the AFS update as this started the day I updated.