labjack com error

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My process give me an error.


When I click on the OK box, a second box appear and say that the labjack is lost.

I can't generate manually this error. It appens randomly. 

My process is very simple. my computer is connected by a good quality USB cable to the labJack. The Lajyck is used for data logging (pH and pO2 value) and connected to a ME-UBRE Relais box. The relay box activate some pump and electrovalves. 

Any ideas about fixing this problem?

have a nice day


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