Kontact truncates adressbook on webdav server

[obengelb Ltd.]

Binary package hint: kontact

Package: kontact
Version: 4:3.5.2-0ubuntu6
Severity: grave
Justification: renders package unusable

Kontact sometimes truncates my server stored adressbook to zero.
This is pretty unpredictable but happens sometimes several
times a day. There is only my personal machine accessing the
addressbook file.
Files are stored on a .htaccess password protected folder as vcard (plain text) adress book (http://my.server.net/webdav/addressbook.ics)
Storing calendar files (ical) on the same server/directory with the same credentials works reliable. Kontact pops up no errors of any kind - it just kills the adress book.

-- System Information:
Debian Release: testing/unstable
  APT prefers dapper-updates
  APT policy: (500, 'dapper-updates'), (500, 'dapper-security'), (500, 'dapper-backports'), (500, 'dapper')
Architecture: i386 (i686)
Shell: /bin/sh linked to /bin/bash
Kernel: Linux 2.6.15-27-386
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8)

Versions of packages kontact depends on:
ii kdelibs4c2a 4:3.5.2-0ubuntu18.1 core libraries for all KDE applica
ii libc6 2.3.6-0ubuntu20 GNU C Library: Shared libraries an
ii libgcc1 1:4.0.3-1ubuntu5 GCC support library
ii libkcal2b 4:3.5.2-0ubuntu6 KDE calendaring library
ii libkdepim1a 4:3.5.2-0ubuntu6 KDE PIM library
ii libkpimidentities1 4:3.5.2-0ubuntu6 KDE PIM user identity information
ii libqt3-mt 3:3.3.6-1ubuntu6 Qt GUI Library (Threaded runtime v
ii libstdc++6 4.0.3-1ubuntu5 The GNU Standard C++ Library v3

Versions of packages kontact recommends:
ii kaddressbook 4:3.5.2-0ubuntu6 KDE NG addressbook application
ii kitchensync 4:3.5.2-0ubuntu6 Synchronization framework
ii kmail 4:3.5.2-0ubuntu6 KDE Email client
ii knode 4:3.5.2-0ubuntu6 KDE news reader
ii knotes 4:3.5.2-0ubuntu6 KDE sticky notes
ii korganizer 4:3.5.2-0ubuntu6 KDE personal organizer

[Rich Johnson (nixternal)]

Is this still an issue? I tried to locate a report upstream but was unable to.

[Launchpad Janitor (janitor)]

[Expired for kdepim (Ubuntu) because there has been no activity for 60 days.]