Thank you in Android 6 its also in at Android Settings / Accounts / More (⋮) / Auto-sync data. I changed it and will test in the evening. The DAVdroid JB Workaround will be deleted too.
I am using Nextcloud 16.01 as CALDAV and CARDDAV source with the Calendar, Contacts and Tasks inside of Netxtcloud. There are really working fine. On my Linux workstation I am using Lightning add-on togther with the “Provider for CalDAV & CardDAV” add-on. And of course DAVX5 for synchronisation of calandars and addresses. I was satisfied with this setup unril I lost a lot of contacts during multi-way synchronisation:
My wife was adding severals contacts to her mobile phone into the defined DAVX5 address book. I tried to get them but instead of receiving the new adresses and phone numbers a lot of other contcacts have been deleted.
Do you know how to debug this issue??
Sounds very weird. Which versions of DAVx5 do you both use? Can you reproduce this error in a test environment? You can activate extended logging to see whats happening during sync - the option is found in the DAVx5 app settings.
To debug this problem: https://www.davx5.com/faq/how-to-debug