fault is not with you, the implementation is not robust (workaround is reboot with power cord plugged or using nextcloud-official). The /e/ dev team acknowledge this has stalled for too long - Gaël sums up the reasons in a comment here: Problem with synchronisation (#1772) · Issues · e / Backlog · GitLab … so instead of leaping into a refactor the current code will see fixes to work again. If the fix is verified in testing maybe this ships with fingercross 0.21 or 0.22 - the Development Updates - /e/ community will feature it if this is the case