If the application crashes or is terminated by the operating system, it will almost never have the chance to log the issue before terminating. In that case, technical support may ask you to send them the crash logs to diagnose the issue. This articles describes two ways to do that.
This is the recommended way, and the easiest. You'll need:
If any of these is unavailable to you for any reason, you can still send the crash logs by e-mail from the iPhone itself (see below).
Proceed as follows:
Depending on whether you're using a Windows PC or a Mac, the crash logs will be downloaded to a different folder
On Windows, crash logs are downloaded to hidden folder %APPDATA%\Apple computer\Logs\CrashReporter\MobileDevice. To open it:
%APPDATA%\Apple computer\Logs\CrashReporter\MobileDevice in the text box