iPhone keep crashing without using any app
I got 3 x iPhone 6 with same issue of crashing iOS this morning.
It just goes to black screen with loading sign and comes back to ask Passcode. It is not App just happens without even opening any App. It is not battery or any other hardware as I did check. As per clients it happened over night in Auckland NewZealand.
It is quite strange issue because it didn't happen straight after update.
Any one has any idea? What it could be and possible solution?
Is this a good question?