first let me say that everything worked perfect to some days ago. No update of server, nothing has been changed in configuration on the server, some updates of davdroid has been done, but the problem has not start occurred after davdroid update. The strangest thing is that in some day something has happened and now some of the events and contacts are not synchronized between server and davdroid.
I don't see any issue in the logs:
Content of Nextcloud-G6HVB9G284F8N9C2L65QN.ics file:
after several synchronizations, the problematic (above) event has been copied but another one not.... I don't know what is happening....
another problematic events: