Endnote LOSES references in my library

EndNote EndNote General
1

I have noticed on two occasions now that when i close MS word 2007 and reopen it and endnote that several refernces that were previosly imported into it are gone.  WHen you unformat and reformat, it cannot find them.  How do I solve this???  Im trying to write a thesis and really can’t have this kind of instability…

Is this something I caused?

Endnote X3, windows 7, ms office 7

2

I am also having a problem losing references from my library. My library is large and I use it primarily to generate annotated bibliographies. This is the second time I have had it drop over 100 references. Anyone else having this problem or am I doing something wrong.

EndNote X1, Windows Vista