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Some of the devices, affected by the problem with the battery, where the phone turns off by its own, tend to do this behavior on iOS versions after 10.2. This was actually the "fix" from Apple's side...
Did you have some spontaneous shut downs while on 10.2?
 
Some of the devices, affected by the problem with the battery, where the phone turns off by its own, tend to do this behavior on iOS versions after 10.2. This was actually the "fix" from Apple's side...
Did you have some spontaneous shut downs while on 10.2?

No! Why ?
 
Yes, I have 6S but I am still on 10.2. I didn't want to take the risk to update to 10.3, because I wasn't sure if this isn't going to slow my phone down
 
Yes, I have 6S but I am still on 10.2. I didn't want to take the risk to update to 10.3, because I wasn't sure if this isn't going to slow my phone down

Well .. Stay there i regret that i pass to 10.3.1 .. witch is make my iPhone so freakin slow.. i hope Apple will give me back what i pay ! Not an " android" phone ... did you know about this problem ?
 
Yes, I got my previous device replaced, because of battery - it was shutting down unexpectedly at 20-30% power left. My current device is ok
Is your phone generally slower on 10.3.1? Did you update straight to 10.3.1 or first to 10.3?
 
Which was your previous version before 10.3.1?
Keep me updated, pls, how your phone performs when 10.3.3 comes out next week.
 
I had the same problem. Its pretty common (check official apple support). The only way to fix this is to change your battery to new. It will help you for sure.
 
Yes, directly after battery change everything back to normal (even when new battery had few %). Phone works like brand new and nothing shutters.
 
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