As written above, i tried connecting the device another way, it’s currently not on the cable, but plugged to the powered USB-hub on my desk. Funny enough, when the device today at the first system start again displayed the hickup, i now also got an info from the X-56 Profiler (my X-56 joystick and throttle are connected via that hub) that they would be disconnected.
This is very curious, it’s almost as if the USB connection itself was broken for a moment. Mind you, this is no “expert analyse”, just the impression the messages and system sounds gave me for a moment, when i had several times the sounds of an usb device being disconnected or connected.