org-caldav-sync hanging

[Loris Bennett]

Hi,

For a couple of years I have had the following in my init.el to sync an
org calendar with a Nextcloud instance:

  (defun lb/caldav-sync-work ()
    (interactive)
    (let ((org-caldav-inbox "~/org/calendar_work.org")
          (org-caldav-url 
"https://nextcloud.work.de/remote.php/dav/calendars/loris";)
          (org-caldav-calendar-id "work")
          (org-caldav-files nil))
      (call-interactively 'org-caldav-sync)))
  (setq org-caldav-debug-level 0)
  (setq org-caldav-show-sync-results nil)
  (run-with-timer 0 (* 240 60) 'lb/caldav-sync-work)

Recently, the call to 

  lb/caldav-sync-work

has stopped working - Emacs hangs and uses 100% of one core.  I have an
analogous function to sync to my home instance of Nextcloud 18 and that
works fine.

The Nextcloud instance at work is version 15 and is accessible via the
browser, but there was some outage recently and some server-side
tweakage may also have occurred while things were being fixed.

Any ideas what the problem might be or how I can debug it?

Cheers,

Loris

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