Miracast : My tablet is rebooting when casting screen using Miracast. Why ?

I have a ClipSonic tablet (Android 4.4.4 Kitkat), and I'd like to activate screen casting.
I also have a miracast dongle.
On my tablet, when I go on the screen cast menu, my dongle is detected. I select it, and I see on the external display that the connection is pending. Getting an IP is OK, and finally the dongle says : "Ready to display".
But at that time, my tablet always reboots...
How can I find out what's wrong with the tablet ? Is there a way to get log files or whatever that could help me diag the problem ?

Thank for any help !

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