Ok, so since updating from 1.62 to 2.18 I have had licence drop several times on a single terminal.
Its only one terminal out of the several there.
When it happened previously I found samba market logged out but licence still installed etc.
No one has admin access other then myself and this includes access to the market module.
Today they had it again but on top of the unregistered trial on header and popups they also got a popup asking for contact details.
The system has gone almost 3 years without any licence issues and now since updating have had 3 drops on this terminal :-/
This was the message received today;
This time rather than just logging back in and restarting I uninstalled and reinstalled licence module too. See ho long that lasts.