I haven't experienced any of those issues they fixed.
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-Restore your phone as NEW
- Do not sign in to any iCloud accounts
- Do not restore any backups
- Do not install any 3rd party apps.
- Use your phone for a week
If after a week all the issues you have been reporting are gone:
- Login to iCloud and do nothing else. Observe for a few days.
- Install 3rd party apps 1 at a time and observe for a few days.
There HAS to be something different in your configuration that is causing you so much grief compared to the rest of us on the 6+ that don't have any issues.
That's a good plan and also thought something has to be different for Sun. We addressed that similarly in Android when having Rooting issues.