Hi Gokhan,
	Greetings!!!!!!!!
	When you closing the application without using DisConnect API, server treated user in paused state, and it will removed after a period of time.
	So that is the reason you are getting Auth_Error, when you reOpen application just after closing it  as user is in paused state on server.
	Let me know if more queries are concern.
	Thanks
	Vishnu Garg