iPhone 6 hanged twice after ios 8.4 update

Hi,

I have recently purchased an iPhone 6. On 30th June, i received an update for ios 8.4. I updated the same and since then my phone has hanged up twice.

First instance was when I was using flashlight and phone was locked- It was not getting unlocked after use so that I can close the flashlight app. I had to shut off the phone and restart again.

Second instance was today morning when I tried to pick a call while my phone was kept on charging. Phone rang continuously even after the call converted into a missed call.

I hope Apple will look into these issues and send fix for the same.