ActiveSync: contacts removed from device

[Tobias Brunner]

Hi,

There is a strange behaviour on my activesync setup: Suddenly all 
contacts have been removed from my device, then a few hours later, some 
of the contacts where added again and some time later the missing rest. 
After that, it was OK for some days but then all contacts were removed 
and added again. Since then it does this every few days. And at the 
moment all contacts are removed and not added again... I already had a 
look at the log file "/var/log/roundcubemail/activesync" but could not 
find any errors.

Any idea how I can debug this behaviour?

Cheers,
Tobias