And from me as well, although I love the module, so don't be disheartened by this. My guess is that the DDCS server is sufficiently busy and or units have moved so far that it's hitting a case you don't see otherwise.
The Viggen is my go-to module, so I'd appreciate a fix, even if it's to revert the data-cartridge generation change (which I am looking forward to in due course), or to allow a client-side option to disable it.