There were problems with shear endless initializing sequenzes.
I tried another computer (my laptop) with fresh install of cyberview X5 and short, direct connected USB cable, no such luck.
Trying with holder in, holder out, sometimes got a connection, sometimes not.
The german software site
https://reflecta.de/de/downloads/drivers2/~nm.50~nc.108/Driver-and-Software.html
had older versions than the US site:
https://www.scanace.com/sd.php?cid=2&pid=8&pcid=21
I made a firmware update to 1.37 – the scanner works again….