The good thing is what will be will be. If the OS is causing some issue it will be fixed
In my circle of relatives and friends during the holidays more people had an issue than have not since the upgrade.
For some it is a reduction in functionality, but a noticeable drop by 1/2-2/3rd of what they normally had for daily usage.
I thought one of them had said they upgraded a couple of their 6S batteries under the lemon Lottery but they still were having problems, but I am not entirely certain so this is just an anecdote.
Belisarius hypothesis is that the underlying problem is a battery issue which was unmasked by the update due to some sort of stress.
For everyone noticing it, the iOS update is what changed everything for them.
It is unclear how many have been affected in some way.
It is likely that the number is relatively small in aggregate.
But it has made for some unhappy lives in the interim. (my case is very sad particularly to me.) 5 minute phone life for a teen is pure purgatory.
Now Apple may come out with a fix for any glitches in the upgrade process as they do.
Some may really need new batteries. The 5 we have may need a new one just the same as it likely already was only 1/2 of its total before this latest unpleasantness.
Anyhow, my fix with a Recovery Factory Restore may work for some as it previously worked for others.
A battery replacement has worked for some.
A battery replacement has not worked for some.
Perhaps an iOS update could help some in the future.
In 3 months most of this will be over with some people so hacked off they don't buy Apple again. Some will have replaced batteries and be happy. iOS updates will continue to roll out and others who have yet to upgrade may perhaps bypass what I view as a buggy 10.1.X roll out.
Happy New Years.
We are all above ground one more year!!!!! rock on.