Shared excel file gets deleted automatically from the system - Help!!!!!!!!!!

[sanjaychowdhary]

Hello

A shared excel document which is used over the network, gets deleted
from the system automatically. I have no idea how it happens or why it
happens, suddenly while saving the document, we get the message like
"Excel file cannot be found". I cannot understand how a file can
automatically disappear from the system, I have done virus scan, but no
virus in the system. Anti-virus is also updated. Can somebody explain
to me why this happens and what is the solution for it.

Thanks