Hi @nillrr, could you kindly advise on the eye tracker you are using along with the details of your system hardware (especially Motherboard, etc).
Frequently, these issues can be resolved by updating the BIOS, USB3 Chipset Drivers or ensuring no USB hub is in use.
With further detail, we should be able to help you further. In addition, there is a support task list you can try to follow @ https://help.tobii.com/hc/en-us/articles/115000436349-Is-your-Eye-Tracker-not-connecting-
Please kindly let us know how you get on.