Have you tested with the default drivers from Windows?
You can get them after uninstalling the graphics driver from the device manager and letting Windows install the driver automatically.
I would also test with different videos, just to discard the video as the source of the problem.
When using OEM devices like this, the recommendation is to download and install the drivers from the manufacturer's webiste. This is to avoid loosing any special feature or setting added by them.
You could test using previous OEM graphics drivers if available.