Thank you for the information. In regard to the crashing, we have solved that issue in 1.7.9. That version is currently in the app store. Could you please update your 1.7.4 version to the latest version and try again?
To be clear about the recent iOS crashing: The app was not crashing per se but clicks stop being registered. The app was still running and updating as shown by running timers etc. This was a bug introduced by Apple in iOS 11.3 and persists in iOS 11.4. The latest iOS 12 beta shows it to be fixed. The bug is a negative timestamp being sent with events when the app is running in the background (eg. lock screen). This bug alone is not an issue but we use Fastclick to remove the 300ms delay in UIWebView (we have now switched to WKWebView in 1.7.9). We now use a newer build of Fastclick which has this bug resolved (uses new Date().getTime() instead of the passed in timestamp).