Sync is currently experiencing problems. It will be back shortly Android S4 my "Calendar" under "Sync settings" in my Google account disappeared. Under the Google accounts at the bottom it reads "Sync is currently experiencing problems.  It will be back shortly"  How do I fix?
We had the same problem, and to make a long story short, tried all the answers we found online (clear cache, clear data, reinstall Calendar, delete, then create Google account, but no factory reset).

The problem for this phone (Samsung Galaxy S3) was that we had restricted background data on Google Play Services. Once that was enabled, the calendar synced right away.

Home> Settings> Connections> Data Usage> Scroll down to Google Play Services, and make sure to uncheck "restrict background data".