How can I kill this evil thing?
This is probably not the place to do it but I figured it would be where I could find someone who fixed it.
- So I had a very nasty behaviour of my exchange work calendar which I synced into my Nextcloud calendar, and it would automatically cancel and recreate all events, which would resend invitations to attendees. It was very unprofessional, to say the least. - After months of this, I finally figured out that the culprit was the calendar auto-backup in the Android Nextcloud client. Turned it off, and my problems went away. Maybe you have something similar going on? 
- Don’t use the Google Calendar app to sync your CalDav stuff - I don’t use Google Calendar, I use Samsung’s. - Samsung calendar accesses Google calendar 
- Get one from F-Droid, and sync with Dav5X 
 
 
- How can I kill this evil thing? - With fire 



