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!