Our company has recently acquired a few Latitude 5420 laptops and most of the users experiencing freezing, we have tried with the latest drivers and firmware's, also have tried with the official intel drivers which made the laptop freeze more often.

We have also tried with older video drivers but its still freezing.

The laptops freeze even when they are not connected to the docking station or a monitor.

As you can see on the photo below the laptop goes black and monitors go to the matrix.