CalDAV sync malfunctioning (server issue)

[catwithbanana]

For the past several hours the CalDAV sync has been going in and out of normal function, causing events on my calendar to disappear and re-appear continually. One event I tried to add this afternoon disappeared after one of these sync fluctuations.

This seems to be caused by a server side issue. Is there an ETA on a fix?

My calendar application reports this error repeatedly:
[CalDAV / CardDAV] Sync of EteSync failed due to the following error: EteSync (Internal Server Error)

This is similar to the sync issues that I have encountered several times over the past few months, including this issue I previously opened:
etesync/server#146