Two of my staff members are experiencing the following issue: They open File Explorer and browse to a folder. They might load a file from the folder into a program. Then the File Explorer window goes to the background while they work on files. When they click on the File Explorer icon in the task bar, the window briefly appears, then disappears. Or, while they are working, the File Explorer simply closes itself and is no longer there.
Staff states that the task bar does not crash, only the that blue line under the File Explorer icon disappears, indicating that no windows are open.
This is apparently not happening on the other 38 installs of Win 10 I did.