I still have not had any luck with settings' modifications. My 6s still dies out of nowhere, even though there is still supposedly a charge remaining on the device. I contacted Apple Support (or lack thereof) and after the mobile diagnostics checked out and all hardware components passed, the rep stated, "This is a really wired situation." Not exactly helpful in the slightest bit.
Here's everything I've tried:
- Hard/Soft reset
- Reinstall iOS from backup and from scratch
- Reset Network settings (This did fix Bluetooth not detecting wireless headphones)
- Turned off Bluetooth, Push settings, background apps, and location services
- Disabled 'Optimized Battery Charging'
- Enabled 'Low Power Mode' 24/7
None of this helped...
[Edited by Moderator]