If the file sits there without being accessed for a while, it gives a message
of "Path/file access error" in vbe. After I click "OK" several times (because
the message keeps pumping up), another message appears, "An unexpected error
occurred. AutoRecover has been disabled for this session of Excel." I click
"OK" and the message is gone. But when I try to save the file, it says,
"Document not saved." So, I have to close the file without saving, then it
sends a typical error message, "Microsoft Office Excel has encountered a
problem and needs to close. We are sorry for the inconvenience." and I have
to choose "Send Error Report" or "Don't Send".

Anyone knows the reasons and how to fix it?