It sometimes occurs at my laptop that all open windows are shown at "random" moment and I am not able to find the reason (and it is quite annoying).
I know that I can get the "show all windows" / "Activities overview" feature by pressing the Super key on my keyboard or by clicking the Activities at the left upper corner (which is fine and I like that).
I have already disabled 'Activities Overview Hot Corner' in Tweaks.
Anyway, sometimes I move my mouse and this "show all windows" feature is activated and I do not know why. Any idea, what may be the reason?
I have read GNOME automatically switching to the window selection screen and GNOME shows activities overview when mouse hover dash and Activities corner keeps "re-enabling" itself, but they seem to me to be similar issues (the same result), but not the same way to produce it.
I use Ubuntu 18.04 with default GNOME.
Update: May it be related to this message that occurred on my screen today?