NI-DAQmx Devices disappeared in MAX Configuration

From time to time, our application will hang (black screen), the reason of this black screen is the NI-DAQmx Devices disappeared under Devices and Interfaces.
When I clicked on the + sign to expand the tree, any of item under My System
- My System
     Data Neighborhood
     Devices and Interfaces
     Scales
     Software
     VI Logger Tasks

I have done that already, it will work for awhile, but then the problem will come back later after several On and OFF on the machine.
I get this error message under System Event Viewer.
The NI Configuration Manager service terminated unexpectedly. It has done this 1 time(s).
Source: Service Control Manager     Event ID 7034
The nidevldu service terminated unexpectedly. It has done this 1 time(s).
Source: Service Control Manager      Event ID 7034
I cannot duplicate the problem if I disconnect the computer from the machine "without" the NI cable connected. It seems this problem can happen when I have the computer connected to the machine.
Johnny

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