Is it possible to test directly on your machine, i can't reproduce it
While I see the Stopping media at 15:04:01 in the MediaPortal log
Are you aware there is also an Application Event happening at 15:04:02?
"04/09/2016 15:04:02";".NET Runtime";"(0)";"Error";"Application: MediaPortal.exe
Framework Version: v4.0.30319
....