I just updated to iOS 11 and am running an iPhone 6S. Since the update, VoiceOver does not always announce my notifications, whether the device is locked or unlocked. I have it set to show previews always in the notification center. Once, when I rebooted the phone and it restarted, it did announce notifications for awhile but then stopped again. I was wondering if this is a bug or if anyone else has experienced this issue or if there is another setting that I need to change. Thanks.