The app software could be to blame if unreceived push notifications are not handled properly.
I do have one app using local notifications which does not fire properly after the iOS9 update and i have not found the cause yet.
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iPhone Problem with notifications in iOS9
- Thread starter Cogsworth
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I do have one app using local notifications which does not fire properly after the iOS9 update and i have not found the cause yet.
I'm having this issue, too--primarily with Calendar app. If I try to set notifications to use default sound or default vibration, when I go back to previous menu, it says None for alert sound/vibration pattern. If I set to some sound or vibration other than default ones, then the setting sticks, but notifications still don't work.
Well, last night I did a Reset All Settings and the notifications were able to be configured correctly and seemed to be working just great. I then did a restore from backup to see if the issue was inherent to my backup, and unfortunately it is :-(
So, I Reset All Settings once more and had to set all my app notifications/privacy settings/TouchID/Apple Pay/etc. up from scratch...but at least my calendar notifications are working now
::hooray::
So, I Reset All Settings once more and had to set all my app notifications/privacy settings/TouchID/Apple Pay/etc. up from scratch...but at least my calendar notifications are working now
::hooray::Well, last night I did a Reset All Settings and the notifications were able to be configured correctly and seemed to be working just great. I then did a restore from backup to see if the issue was inherent to my backup, and unfortunately it is :-(
So, I Reset All Settings once more and had to set all my app notifications/privacy settings/TouchID/Apple Pay/etc. up from scratch...but at least my calendar notifications are working now
I'd suspected the same thing and restored my device and set it up as new, however the problem still exists for me
Running a 6S+ and seeing the same issue. Notifications are inconsistent. Resetting them helps for a while (it appears) however they go back to the Hit/Miss after a bit.
I've been sitting here all morning with my phone on the desk watching notifications come in from various apps and I would say I only get audio and vibration on about 1 out of 4 now with no rhyme or reason. This is ridiculous I hope Apple addresses this in the next update. 
I ask myself "tim does not using an iphone? " this is really ridiculus not to have been solved yet. Never had this problem in ios 8!
I've been having this issue on a 6S+. I've been going through my list and just turning off all notifications for apps. I'll try the Reset All Settings, but so far, I've been going through in batches and turning off notifications for all of my apps, and nothing has been working. I've had 4-5 random non-visible alerts/day even though all apps are set to be visible in the lock screen and the pull-down notification center.