Failed To Update iOS 12 Beta 7 And Lose iPhone Contacts?

Today in the morning, Apple released iOS 12 developer beta 7 but withdraw the update after three hours due to performance issues. Obviously, iOS 12 beta 7 is a significant update because it removes the Group FaceTime feature and add special new in Messages, but it also forced to stop updating by Apple. What issues we have found on iOS 12 developer beta 7? App pausing issue Some users have said that the pausing issue disappeared for them after five or 10 minutes of using the iPhone,...