Ah, sorry I thought I was in the DAVdroid forum… With ICSdroid you can always set the minimum interval that you need for one calendar, the others only get updated when there are changes on the server so there is no unneeded traffic. See here because we’re often asked about it:
Once every few weeks my calendars from icsdroid disappear and I have to add the URL to the app again. I’ve missed a substansial amount of reminders because of that.
Had never happend to me, and without any further hints I can’t say anything about that. Maybe a 3rd-party app which is messing around with calendars?
I use DAVDroid and OpenTasks on the same device
I can comfirm that my calendar also disappears in the app.
I also use DAVdroid + OpenTasks + ICSdroid on a Oneplus3 with LineageOS 14.1.
I have the same problem. Also have DAVdroid + OpenTasks installed with LineageOS.
Is there any way to do a backup of the calendar settings? I tried using Titanium Backup, but was not able to restore the settings after all calenders disappeared.