My calendar-factory seems to be stuck in an endless loop...

> OPTIONS /caldav/v2/dwmw2%40infradead.org/events/ HTTP/1.1
> Soup-Debug-Timestamp: 1478733434
> Soup-Debug: SoupSessionSync 1 (0x563fa34f24c0), SoupMessage 1016 (0x7fcfb40071a0), SoupSocket 1016 (0x7fd004003420)
> Host: apidata.googleusercontent.com
> User-Agent: Evolution/3.18.5
> Connection: close
> Authorization: Bearer ...
  
< HTTP/1.1 403 Forbidden
< Soup-Debug-Timestamp: 1478733434
< Soup-Debug: SoupMessage 1016 (0x7fcfb40071a0)
< Vary: X-Origin
< Content-Type: text/html; charset=UTF-8
< Date: Wed, 09 Nov 2016 23:17:14 GMT
< Expires: Wed, 09 Nov 2016 23:17:14 GMT
< Cache-Control: private, max-age=0
< X-Content-Type-Options: nosniff
< X-Frame-Options: SAMEORIGIN
< X-XSS-Protection: 1; mode=block
< Server: GSE
< Alt-Svc: quic=":443"; ma=2592000; v="36,35,34"
< Accept-Ranges: none
< Vary: Origin,Accept-Encoding
< Connection: close
< 
< Daily Limit Exceeded. The quota will be reset at midnight Pacific Time (PT). You may monitor your quota usage and adjust limits in the API Console: https://console.developers.google.com/apis/api/caldav/quotas?project=923794261470
  

It's doing this over and over again in quick succession; I think I'd better kill it. When I refresh the calendar through the UI, it shows nothing at all; just doesn't update. No hint of the error is shown. When I try to add or delete a calendar event, I get an 'Authentication required' error.

This is in Fedora 23. I tried in 3.20.x on Fedora 24, and it's worse there. When I try to add the Google calendar by enabling that slider in GOA, an error *flashes* up in Evolution but disappears instantly, and the Google calendars aren't in the list.