Online licencing timeout?

We have 3 seats here all on online licencing.

On just one installation, if the user leaves his PC inactive for half an hour of so he is prompted to save and close because the online licence is no longer available. He can then log in and get it back running.

But this does not happen on any other seat. I can leave my solidworks open over the weekend and come back to it Monday without this problem.

So my question is:

WTF?

2019 SP4 Win10

SolidworksGeneral