My 2-week old Galaxy Stellar suddenly stopped syncing all of my Google services yesterday. I followed the advice I found in another thread and removed my Battery Saver and Task Killer apps--which both seemed to be a waste, anyway--but no luck. I have power cycled the phone, but still no luck, either.
I can't get any of the services to sync manually. If I log into, say, the G+ app, everything is fine, so I know it's not a problem with my account.