If Documents stops responding, make sure the latest iOS version is in use on your device, restart your device and send the system log file to us so that we can investigate the issue:
Please contact our support team and describe your actions when the app stops responding and provide the logging at rdsupport@readdle.com:
As a temporary solution, try the following steps:
Please note: if you are not able to access your data in Documents due to the freeze issue, as a temporary solution, you can access files in the Files app (iOS 11 and later) > Documents extension: