He didn't lose the connection, just doesn't open the file, as if it was damaged, even locally.It is a message that says nothing to understand the problem.
If it was lost reference to the part you would have the message "file not found, navigate to the file.... blah blah blah.
the problem is that the change I made itches to save, he recovers me that yesterdaysearch in the backup folder (see address in system options) if you have saved a copy