Hi Gianluca
I'm using SP3 and it always done that at infrequent intervals. I've noticed
that it always happens after I've done a Ctrl+Z to undo, maybe yours is the
same. When I say infrequent, I mean months between events but I don't use it
much anymore so that could be the cause of the increasing duration between
events. I've overcome the problem with frequent saves and backups.
HTH
Glen
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