QUOTE(lisahasan @ Oct 9 2017, 01:04 PM)
happened after update to ios 11.
even restart, it will happen again next few days.
and now on 11.0.2, still happened.
add on, i just update directly using itunes. no clean install.
I assume that all apps have been updated after 100.0.1? I remember most of the apps required to be updated as to conform to ios11.
If you have done so and yet the issue still persist, might I suggest to hard reset your phone and restore as a new phone. Of course do a full backup before you do this.
Then run it as a new phone but with ios11 on it. If the issue is resolve, it will mean that there is an app or several apps that is making the system freezing.
Another is to basically switch off all the notifications, background app refresh, location services, assitive touch. And check whether it is stable or not. I would try this first. If still fails, only do I hard reset to new phone. If, as a new phone also freeze, then an SC is suggested. There might be a hardware failure.