You should then ask here, to be sure it's not a hardware issue, the USB dongle could be still one bit of the problem, using without could show if it has to do something or not with the issue.

https://dreambox.de/board/

then also you can check on the hardware section of Johnny on his forum, that is here,

https://jb8a8f8.com/support/index.php?forums/hardware-troubles-and-repair-support.43/

Try with our latest OpenPLi image... perhaps this problem is linked to the software/image you use.

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