Hello Chuck,
thank you for your ideas. Actually I am running on a linux system, so I do not have this device manager. But I capture your thoughts and checked power saving settings in the BIOS (unfortunately without success).
I also contacted a friend with more linux experience then me. He recommended “dmesg -wH” to monitor what is happening:

What I see is that the device gets several reconnects.
The log, when engaging the homing function in LightBurn, looks similar:

The serial number “123456” is suspicious, but I guess these reconnects are the issue.
I even tried several USB cables - all with the same behavior.
Looks to me that this is a clear device issue that cannot be solved with LightBurn.
I’ll try to contact the vendor.