dual screens keep going black

I am using a MacBook Pro (15-inch, Mid 2012)

NVIDIA GeForce GT 650M 1 GB

Intel HD Graphics 4000 1536 MB

I have two ASUS Screens and I am using the Matrox Dual Head 2 Go Digital ME

My screen keeps going black and it is driving me crazy.

I have downloaded the post up to dated drivers and using High Sierra 10.13.3

HELP...