deleted entries

Titles I add to my library disappear from it the next day. Now when I add a citation in a paper, it tells me that half of the titles that I added previously are not in the zotero db anymore and asks me if I want to update. I have to click no for each individual title, and each time I add a new citation, I have to do the same thing again
Does anybody know
-how I can prevent entries from being deleted?
-how I can update or refuse to update once and for all, instead of every time I add a citation?
Thanks
  • Hi Flora,

    We have not had other reports of items being deleted from individuals collections. Could you clarify. Are you using some sort of public computer that wipes out all the data on a daily basis and do you have the most recent version of Zotero? (Gear icon--> About Zotero)

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