Hi @SergioCostas
Thanks for your reply. Unfortunately Snap Store is based on GNOME Software. I’m running XFCE desktop manager. So no Snap Store is installed. I manually update snaps from the command line to stop the frequent messages from re-appearing.
From experience I can answer that snapd does not do a check for the specific PID that has to be updated. When it is killed it does not do an update in that precise moment. One has to be vigilant in updating the snaps manually each time the notification messages (that appear on top of all windows) start appearing or you have to endure the constant messages until the countdown days expire. I could never take that so long, because the notification popup messages keep getting in the way of other content.