I got a reply to my last Support ticket yesterday.
This is for Mac - no explanation but a link to this version of the E-Licenser app
"Please de-install the current eLC and re-install the latest 32 bit version from
(note - it’s marked 32Bit)
Which I have done and - NO MORE ERRORS for 24 hours now. It’s a bit early to say for sure, but I’m allowing myself a little bit of hope.
And Tech Support have marked my ticket SOLVED so it must be, right?
Note that the Steinberg website was down for maintenance yesterday - the new site is running today.