I've just started getting this error as well. I too keep my wifi off and sync once a week or so (my last sync before today was actually 11/22), mostly to get books from Overdrive.
My sync goes on forever with a lot of partial home screen flashing and eventually times out with a network error. I noticed that the sync seems to almost complete: it downloaded 4/5 new books, but I'm missing one of them. I checked Kobo's bookstore and the book indeed exists so there should be no error on the pass-through from Overdrive/Rakuten.
I also powered the device on/off with no change in behavior.
Sigh...
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