Thanks for your replies thus far guys, the issue we have here is the inability to reproduce the problem, which is making hard to diagnose.
One thing I see we haven’t covered yet is perhaps trying to update the USB3 Chipset drivers on your respective systems.
Also, we have a new release of the EyeX drivers available @ http://developer.tobii.com/eyex-setup/
Try to update both these software and let me know.