Comment by chrismartin

I also use Radicale. My only annoyance is that when you use its built-in HTTP server, the process eventually stops working if one of your clients has an intermittent connection (e.g. phone with a poor signal).

https://github.com/Kozea/Radicale/issues/266 https://github.com/Kozea/Radicale/issues/388

I'm told that using a dedicated HTTP + WSGI server solves this, just haven't done the work yet.