Update #1:
iOS 9.0.2 is released.
Update #2: Issue confirmed in isolated cases at
Apple forums
Update #3: New survey questions (thanks notgreg)
View the latest data here.
Issue:
Many users have found out that their iPhone 6S, 6S+ (some 6) turns off by itself, even when left unattended. It is fixed by forcing a restart of
holding the home and power button for 10 seconds. Had this issue? Read below.
Survey:
Please answer these questions. If you are a beta tester, submit it to Apple's bug report as well. The more they see, the higher priority it gets.
1. Model, OS, and actions before the problem occurred. 6s, iOS 9.1 Public Beta , phone was idle with 100 charge
2. Was the device started as new, or restored from a backup? restored from backup
3. Was it restored through iTunes or restored through iCloud? iCloud
4. Has the device logged any kernel panics? Yes
5. Has the device displayed a heat warning prior to shutting down? No
Gathering all the data is a tedious process. Please post only if you have the relevant issue to make things more efficient. I've forwarded this document to Apple's engineering team.
Kernel Panics:
Settings>Privacy>Diagnostics & Usage>Diagnostics & Usage Data.
-There is no need to scroll through the list, as the only important logs will be at the top and they will start with a long string of numbers. (
example here)
Sample Diagnostics:
1. iPhone 6S 64 GB Gold, iOS 9.01, idle state
2. Restored from backup
3. Restored through iCloud
4. None
5. None