Actually this is an issue that just recently popped up with the Breeze Cam app. It is even exhibiting this behavior on older iPhones like the 5S running iOS 10.3.3.
I submitted a report to Yuneec CS and they have responded and say they are working on this issue. It has been a little over a week since I submitted the CS ticket.
I have been able to uninstall and reinstall the Breeze Cam app and actually get it connected with the Breeze. I left it in Pilot mode and hovered for a few minutes. After landing and shutting the Breeze down I attempted to connect again and the app would crash as soon as you press the Next button on the opening screen.
If you are experiencing these issues, DO NOT FLY YOUR BREEZE!!! The app is unstable in this condition and it is not safe to fly the aircraft beyond a low hover. Let’s give Yuneec a chance to remedy this situation. It is like there was a time bomb in the app. I have not tried the Android version of Breeze Cam as the only Android I have is a Fire 7 tablet and the video lag is terrible.
If others are having these issues with the Breeze Cam app, reply to this thread and submit a ticket with Customer Support.
This is the other thread discussing this problem
Breeze Cam IOS version crashing on use.