After update (Debian 8 => Debian 9) KDE messes up all desktop icons

[Luca Bertoncello <lucabert@lucabert.de>]

Hi list!

I use KDE since years and had almost no problem. Until now... :(

A couple of weeks ago I updates my PC from Debian 8 to Debian 9.
Now I have KDE 5.28.0-1 from Debian repositories.

I works relative OK, but every couple of day, when I start my PC and log 
in, all desktop icons are messed up on both monitors and I have to 
reorder them or copy the file 
.config/plasma-org.kde.plasma.desktop-appletsrc from a backup and login 
again.

I set up KDE NOT to sort icons.

Have someone an idea what can I do to solve the problem?

Thanks a lot
Luca Bertoncello
(lucabert@lucabert.de)