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Mine had the same hangup with the contacts. I went into accounts and sync, pressed Google, verified the checkboxes were all checked and then hit sync now. I may have had to uncheck calendar then sync now, then recheck calendar and sync again. Can't remember the exact order of events but it finally woke it out of it's slumber and started working. Been working ever since without problems.
If that doesn't work, I'd probably use the "remove account" button and then set it back up from scratch using your account name/password. Shouldn't take long at all and maybe that would spring it back to life.

Yeah thats not working for me![]()
I REALLY dont want to factory reset, I HATE doing that.![]()
Know what u mean. Another idea might be to try Settings > Applications > Manage applications > Contacts storage and clear data. Then see if it syncs on its own normally or try forcing sync again as before.

Another idea might be to try Settings > Applications > Manage applications > Contacts storage and clear data. Then see if it syncs on its own normally or try forcing sync again as before.
Know what u mean. Another idea might be to try Settings > Applications > Manage applications > Contacts storage and clear data. Then see if it syncs on its own normally or try forcing sync again as before.
Thank you, that worked for me too after a 2 months struggle!Know what u mean. Another idea might be to try Settings > Applications > Manage applications > Contacts storage and clear data. Then see if it syncs on its own normally or try forcing sync again as before.

Thanks dear. It helped me to get Sync my lost contacts in my Samsung Galaxy S-II with Android v4.1.2 (Jelly Bean). 
Know what u mean. Another idea might be to try Settings > Applications > Manage applications > Contacts storage and clear data. Then see if it syncs on its own normally or try forcing sync again as before.