Audi MMI unit 3G Black out Restart Problem " Trouble shoot Fixed Repair "

*I intentionally disconnected the fiber cable connector for video posting.*
Freezing of MMI UNIT can be done simply by rebooting.
If there is no effect with the method of rebooting
My MMI Unit repeats blackout, restart from the screen logo.
It returned by this method.
If this fiber cable is disconnected or dirty, it is posted as operation of MMI unit.
Even when the connector is attached to the MMI unit.
There is a possibility that it will be operated by plugging in and pulling out.
This video posted as one problem.
If it does not operate in this way, the MMI unit may be faulty.