Updated Ultimaker 2+ board needs to cool down

[3ddrucker 0]

I have an uptdated Ultimaker 2+. After changing the board from version 2.1.1 to 2.1.4 (with the older version the printer lost the gcode for a little time, so that the z-axis lost his position) I can not start the printer. It leveled the z-switch and than stucks the stepper with an ugly nois. I proved the z-switch, it gives the sign to the board. cura is download Version 2.6.2. After it I changed back the old board, and printer start as usual. I am cooling the stepperdriver with heat sinks and the printer works with the old board about 1 hour without problem. Before cooling it works only for a few minutes. Can you give me an advice what I can do to work with the controllerboard version 2.1.4.? Thanks for your Reply.

[Dim3nsioneer 540]

@3ddrucker I fear you will not get many answers here as this topic deals with the Ultimaker AMA (the meaning is not that one can ask here anything ?). I recommend to put the post somewhere in the Hardware section.