Had early problems, using 8310 Curve and BIS. Never used Contact updates, because my Google Contacts is NOT a complete set! Stopped the automatic sync and number of problems (dupes of calendar) went to near nothing!
Occasionally (once every three months!) it will rear up its ugly head and duplicate most entries, or it will be unable to get the list of multiple calendars I use on the desktop.
On dupes, I delete the whole thing, and do a double sync, once with my default calendar, and the next with all the calendars. And all is well!
On inability to d/l list of calendars, I just try a little later.
I can report that i rely on this calendar syncing probably 99% and have had success.
C-L
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