I just updated to iOS8. My calendar won't stay open! I had this problem in iOS7, and a suggestion somewhere told me not to sync with iCloud and that should take care of the problem. After I stopped syncing with iCloud, it worked sometimes. I saw some other suggestions that said to turn off all calendars and then turn them back on. I did that with iOS8, but as soon as the calendar populates, it shuts down. Help!