A number of iPhone users who have updated their devices to this version of iOS are reporting issues with their devices. Apple built a reputation around iOS with the phrase, “it just works”. In reality, it is not always so. iOS 9.0.2 clearly seems to be riddled with bugs.
Some of the problems being faced by users after updating include broken notifications, touchscreen going black or not responding, battery issues, loss of network data in certain apps, overheating during usage of some apps, and phone not turning off when required to.
While iOS 9.0.2 itself was released to fix some earlier bugs, it seems to have come along with bigger issues of its own.
One simple word of advice: do not update to iOS 9.0.2 yet. You never know what lies on the other side.