This is a documented hardware problem that's been known since 2012. USB 3.0 transfers data at 5 gigabits per second to do that it generates electrical signals at a fundamental frequency of approximately 2.5 GHz. the scrambling process used to transmit data produces broadband radio frequency noise that bleeds directly into the 2.4 to 2.5 GHz range. that's exactly where your 2.4 GHz WiFi is along with your Bluetooth devices, your wireless mouse, your wireless keyboard, and anything else running on that band. Intel's own testing found that a USB 3.0 device can add up to 20 decibels of broadband noise to the 2.4 GHz band. 20 decibels is not subtle. what this looks like in practice: — slow WiFi that only affects one device — a wireless mouse that stutters when a hard drive is plugged in — Bluetooth audio that drops when you're transferring files — a WiFi dongle that performs worse than expected despite being close to the router the noise comes from the connector on your device, the external peripheral, or the cable itself. Cheap unshielded USB cables are the worst.