Most sync issues are temporary. Don’t panic, everone. Usually, your account will sync again after a few minutes. I had the error message (“Sync is currently experiencing problems. Sync will be back shortly.”) on myandroid phone this morning. After about 6 anxious hours (not exactly “shortly”), the error self-corrected, and the sync function had returned to normal. Patience proved that less is more. But if you keep having sync issues, try the following solutions.
Manually sync your Gmail Account
Open your phone’s Settings app.
Tap Accounts. If you don’t see “Accounts,” tap Users & accounts.
If you have more than one account on your phone, tap the one you want to sync.
Tap Account sync.
Tap More More And then Sync now.
Go to Settings → Accounts → Exchange → Incoming Settings and change the security type to SSL/TLS from SSL/TLS (accept all certificates) and there you go. All the emails, contact, calender will start syncing.