Do you get different results after disconnecting some of the USB devices?
Yes - I get different results when disconnecting some of the devices.
What type of USB devices are you connecting?
Do they use separate power supply?
The USB devices are:
- standard mouse & keyboard,
- three 3rd-party hardware units (a digital ultrasound, a 3D position tracker, a frame grabber), all receiving power from the USB socket,
- and a touch-screen ("cursor data" is sent over the USB link), using separate power supply.
Do you have the latest Intel® Chipset, Intel® Management Engine and USB 3.0 drivers?
I do not know how much power those devices draw but you may consider an external powered USB hub.