Is it ios 9 or apps?
I was using iPhone 5s (brought as used) awhile back before getting a new iPhone 6.
On my iPhone 5s running iOS 8, everything was ok, no notifications delay or notifications comes in for already read or seen messages etc. I upgrade the iOS 8 to iOS 9, notifications delay etc started after the upgrade, meanwhile when I noticed this, I checked online and most of the search pointed towards hardware issue. I brought my iPhone 5s as used so I felt, the hardware is giving up.
Now to my surprise, same issues of notifications delay, notifications for already read messages is still happening on my new iPhone 6 running iOS 9. Surely it can't be hardware issue now.
Is it iOS 9 having this issue or the apps not working very well on iOS 9? Eg: my yahoo messenger won't give notification when I get a message (locked screen or not), same thing for my hangout.
This is annoying cos I felt getting a new iPhone would solve this but it hasn't.
To add to the issues of notifications delay for new message, no notifications at all, notifications for already read message, I have a glitch on my iPhone, sometimes when I press the home button, part of the screen pushes the app down and the upper part is black (attached is the image)