It happens on both mobile and wifi.
I do not use any ad blocker or proxy on my phone.
The phone is Samsung galaxy S4 (GT-I9505).
So I finally tried to restore factory settings on my phone. And it did not help
I don't know if I am able to do something more in an attempt to wipe everything. As soon as I connected to my account, the phone downloaded all my old apps and probably restored many old settings.
I have identified an app, it is Google Drive, which always triggers an error message:
"An application has been forced to stop for an unauthorized attempt to access system in your device"
The app never opens
And triggers the empty popup window to appear.
However the empty popup window still rarely appears even with the Google Drive uninstalled.
I want to use Google Drive, but I can't since July. Any more ideas what I could try please?