Thanks Ukko If it was ON with your first visit -> maybe there are some troubles with launching ULAV UI startup task (with certain situations). Maybe Windows Journal?! (Even Viewer?! / Events and Errors Message Center?!) with some information about it (?!); That is what I am saying. I can have a look at the events the next time it happens. Rebooted the VM and it is still in systray. When making the fisrt post I did not looka that the start up items in Task manager, but now ULAV is there. No major problems using 1809, but I've got KB4464330 installed. I'll get back if it reoccurs.
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