Hi @witian, sorry to hear about your issues. As it sounds like you could potentially have a hardware issue or more serious fault, we would first recommend you raise a ticket directly with our dedicated support team @ https://tech.tobii.com/contact/ who may be able extract logs from the device and advise accordingly.
In the meantime, it may be worth checking to see if the issues persists across other systems if possible, try other USB ports and be sure to update your BIOS and USB chipset drivers in case the fault may lie there. We hope you managed to resolve the problem swiftly. Best Wishes.