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A customer reports that devices are coming out of single-app mode and becoming unresponsive. They manage the MDM (AirWatch) and report that some devices leave single app mode over and show a blank white square on the home screen, almost like a widget or OS message, but without content. This mostly happens overnight, the only resolution is to remove the enclosure and physically reboot the device. Our application doesn't have any widgets and we looking for any ideas on what may be causing this issue.