Updated a few days ago. I so far only have one issue.

It is a company phone and is only used during working hours, so I use the timer power off/on function.
This resets the ringtone every time. A bit annoying.

I will try the factory reset option.

I have not been able to use my Bluetooth intercom since upgrading to Android 7. The phone sees the device but will not connect to it. I have tried restarting, removing the device from the phone and trying to re-pair. I also keep getting Google Play services has stopped messages

After restart, android is not remember for some settings :
Font size on small go to default (but in settings is set to small. Must click default end back small to go small).
Battery is not show percent in lock screen(must go in settings and turn off and on battery percent to show).
Adjusment in sound is go to default (volume adjust)
Compass is not stabile
Battery is drain wery fast - THIS MUST FIX
I downgrade to android 6 (20161011)