Library on Zotero server not actualized?

Hello,
I’m having some problems to sync my Zotero library. Sometimes I’m getting “Empty response from the server”. The last intent, I got that there were 3020 items to sync. It seems that my library on Zotero server was not been actualized since March 2010. However, until beginning of January, when I started having problems, I kept it synced.
Any clue?
Thanks,
Nuno

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