Calendar and Contacts sync again not working

I'm quite a bit out of clou...

Again I find that my calendar and contact entries are not synced with the owncloud 
server.

It worked nicely for some days - and suddenly stopped that.
It doesnt give me any sign of having trouble - I just cant find my calendar entries at 
the server and vice versa.

I tried to set up  a new set of calendars at Kontact - but it could only fetch a 
handful entries and stopped without completing.

Sync Android <> server still is o.k., calendar and contacts as well.

What can I do? - And what can I do to make Kontact a bit more verbose?

Here is the console output:

wd@Simux:~$ kontact 
QDBusConnection: session D-Bus connection created before QCoreApplication. 
Application may misbehave.
QDBusConnection: session D-Bus connection created before QCoreApplication. 
Application may misbehave.
Hspell: can't open /usr/share/hspell/hebrew.wgz.sizes.
kontact(4385) KDirWatch::removeDir: doesn't know 
"/home/wd/.kde/share/apps/messageviewer/themes/" 
kontact(4385) KDirWatch::removeDir: doesn't know 
"/usr/share/kde4/apps/messageviewer/themes/" 
void DBusMenuExporterPrivate::addAction(QAction*, int): Already tracking action 
"Ordner hinzufügen ..." under id 28 
void DBusMenuExporterPrivate::addAction(QAction*, int): Already tracking action 
"&Neue Nachricht ..." under id 25 
void DBusMenuExporterPrivate::addAction(QAction*, int): Already tracking action 
"Nachrichten &suchen ..." under id 68 
void DBusMenuExporterPrivate::addAction(QAction*, int): Already tracking action 
"Ordner hinzufügen ..." under id 278 
void DBusMenuExporterPrivate::addAction(QAction*, int): Already tracking action 
"&Neue Nachricht ..." under id 275 
void DBusMenuExporterPrivate::addAction(QAction*, int): Already tracking action 
"Nachrichten &suchen ..." under id 315 
kontact(4385)/kdeui (KAction) KActionCollection::setComponentData: this does 
not work on a KActionCollection containing actions! 
kontact(4385)/kdecore (trader) KServiceTypeTrader::defaultOffers: 
KServiceTypeTrader: serviceType  "KOrganizer/Part"  not found 
void DBusMenuExporterPrivate::addAction(QAction*, int): Already tracking action 
"Ordner hinzufügen ..." under id 738 
void DBusMenuExporterPrivate::addAction(QAction*, int): Already tracking action 
"&Neue Nachricht ..." under id 735 
void DBusMenuExporterPrivate::addAction(QAction*, int): Already tracking action 
"Nachrichten &suchen ..." under id 775 
void DBusMenuExporterPrivate::addAction(QAction*, int): Already tracking action 
"Ordner hinzufügen ..." under id 900 
void DBusMenuExporterPrivate::addAction(QAction*, int): Already tracking action 
"&Neue Nachricht ..." under id 897 
void DBusMenuExporterPrivate::addAction(QAction*, int): Already tracking action 
"Nachrichten &suchen ..." under id 937 

wd@Simux:~$ kontact(4385)/kdepimlibs (kcalcore) 
KCalCore::ICalFormatImpl::Private::readIncidenceBase: The incidence didn't have 
any UID! Report a bug  to the application that generated this file. 

kontact(4385)/kdepimlibs (kcalcore) 
KCalCore::ICalFormatImpl::Private::readIncidenceBase: The incidence didn't have 
any UID! Report a bug  to the application that generated this file. 

kontact(4385)/kdepimlibs (kcalcore) 
KCalCore::ICalFormatImpl::Private::readIncidenceBase: The incidence didn't have 
any UID! Report a bug  to the application that generated this file. 

kontact(4385)/libakonadi: Incidence has empty UID. id= 50818 ; summary= 
"Schlüsselerlebnis mit Paul" Please fix it. Ignoring this incidence. 
kontact(4385)/libakonadi: Incidence has empty UID. id= 50817 ; summary= 
"Schlüsselerlebnis mit Paul" Please fix it. Ignoring this incidence. 
kontact(4385)/libakonadi: Incidence has empty UID. id= 50816 ; summary= 
"Schlüsselerlebnis mit Paul" Please fix it. Ignoring this incidence. 
kontact(4385)/libakonadi: Incidence has empty UID. id= 50818 ; summary= 
"Schlüsselerlebnis mit Paul" Please fix it. Ignoring this incidence. 
kontact(4385)/libakonadi: Incidence has empty UID. id= 50817 ; summary= 
"Schlüsselerlebnis mit Paul" Please fix it. Ignoring this incidence. 
kontact(4385)/libakonadi: Incidence has empty UID. id= 50816 ; summary= 
"Schlüsselerlebnis mit Paul" Please fix it. Ignoring this incidence. 
kontact(4385)/libakonadi Akonadi::CalendarBasePrivate::internalInsert: Discarding 
duplicate incidence with instanceIdentifier= 
"[email protected]" and summary  "Geburtstag von 
<name of a contact>" ; recurrenceId() = KDateTime() ; new id= 50783 ; existing id= 
50784 
kontact(4385)/libakonadi Akonadi::CalendarBasePrivate::internalInsert: Discarding 
duplicate incidence with instanceIdentifier= 
"[email protected]" and summary  "Geburtstag von 
<name of a contact>" ; recurrenceId() = KDateTime() ; new id= 50781 ; existing id= 
50782 
kontact(4385)/libakonadi Akonadi::CalendarBasePrivate::internalInsert: Discarding 
duplicate incidence with instanceIdentifier= 
"[email protected]" and summary  "Geburtstag von 
<name of a contact>" ; recurrenceId() = KDateTime() ; new id= 5754 ; existing id= 
50788 
kontact(4385)/libakonadi Akonadi::CalendarBasePrivate::internalInsert: Discarding 
duplicate incidence with instanceIdentifier= 
"[email protected]" and summary  "Geburtstag von 
<name of a contact>" ; recurrenceId() = KDateTime() ; new id= 5753 ; existing id= 
50787 
kontact(4385)/libakonadi Akonadi::CalendarBasePrivate::internalInsert: Discarding 
duplicate incidence with instanceIdentifier= 
"[email protected]" and summary  "Geburtstag von 
<name of a contact>" ; recurrenceId() = KDateTime() ; new id= 5752 ; existing id= 
50786 

uint DBusMenuExporterDBus::GetLayout(int, int, const QStringList&, 
DBusMenuLayoutItem&): Condition failed: menu 

(kontact:4385): Gtk-CRITICAL **: IA__gtk_progress_configure: assertion 'value >= 
min && value <= max' failed
<repeated several times>

uint DBusMenuExporterDBus::GetLayout(int, int, const QStringList&, 
DBusMenuLayoutItem&): Condition failed: menu 
<repeated several times>

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