nvidia shield tv - sdcard internal storage not mounted

I have a Nvidia Shield TV. I set up a Samsung EVO Plus 128gb Class 10 UHS-1 sd card as internal storage and move data to it. After the data was moved I tried same Apps - all works, but ES File Explorer says I have to reboot. So I reboot the shield and now the sd card isn’t mounted anymore - „/sdcard not found“. Under Settings - Storage the sd card is under internal storage. If I open it all items (Apps, ...) have Total space: Calculating...
If I try to move the data back to internal storage (Settings - Storage - Internal storage - Move data now), I get the error: Could not migrate the data to internal storage.

How can I get my data back?
I have root access to the shield. Is where a way to manually mount the sdcard with adb.
Please help!

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