I was using DAVDroid on my old phone and it worked perfectly with my baikal server. Unfortunately, after buying a new phone that now runs CM13 (Marshmallow) I regularly experience problems with auto-syncs. Although a 120 minute sync is set up in the settings, DAVdroid stops randomly. The issue will not be fixed until I reboot the phone. I set up the account several times but I had no success so far - DAVDroid finally decides to stop after a few hours / days.
Thank you so much in advance for helping me out.