Help Sony Z3 Contact sync issue


My google contacts failed to sync with my Sony Z3 since two weeks ago, but all other Google items (mail, calendar etc) are syncing properly.

I have tried to remove and add back Google account, and have also even done a factory reset on the phone. However, I am still having issues with the sync. Strange thing is, after the factory reset, approx 300+ contacts (out of 800) were synced to the phone. But when I tried to manually sync contact again, there was no response.

Another thing I noticed was that the sync between Google and my iPad is still working ok.

I have no clue of what went wrong, and badly need help to fix this problem!