Sorry for my non existing response, I somehow missed your post. The Issue is probably as @devvv4ever writes not nextcloud related. I changed for testing purposes my dav-Server to baïkal and katana (both are no longer maintained), still had the problem.
As written in my previous post, resetting my phone did help at first. A few days ago, I broke the camera of my old HTC 10 with LOS 14.1, time to move to my Nokia 6.1. Well, after setting everything up the issue is back 😠
ICSdroid is also affected, interval is switching back to manual after a reboot.
I’d like to help troubleshooting this issue, what can I do?
P.S.: can I unmark this thread as solved?