config file .config/plasma-org.kde.plasma.desktop-appletsrc

Using : Leap 15.3 up to date with KDE. In about 1 of 10 reboots the file 'plasma-org.kde.plasma.desktop-appletsrc' is replaced with a default one. The result of this replacement is that my desktop is also default. My simple solution is  copy the file from a backup. My question: What can be the reason of the replacement of this config file ? Thanks, Hans