CDU v3 starts in AV connection mode - should be VGA

Hello,

I have connected an OC CDU v3 module with the VGA cable to the PC.
But sometimes the CDU starts in the AV mode, where no input is connected. To correct this, I have to unmount the cdu from my CDU bay and hit the switch input on the back once, to jump to VGA. Than it is working as it should... Any ideas how to force the module to start per default with VGA connection?

thanks a lot
Markus