zotero stopped syncing -- database corrupted?

Hi,
I've been using zotero for two years without too many problems, and have a database of 3500+ entries that are synced. However, for some unknown reason today the sync stopped working. When I try it, it returns 273 conflicts and once I resolve them, it tells me that my database is corrupted and needs to restart Firefox and restore a previous version of my database.
Please help me. I need the syncing feature, and I've paid to get zotero storage to store my PDFs.
Best regards,
Etienne
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