The other day a question from a reader reminded me that there are possible downsides to using USB 3 and USB-C devices.
Quick question – When I plug my USB 3 hub into my Mac I notice that my Wi-Fi connection slows down and sometimes even drops. Any idea what the problem is? Is it a problem with my USB port?
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The problem here is not with the USB port itself, but actually an issue that relates to some USB 3 and USB-C devices.
Some USB 3 devices generate radio interference in the 2.4GHz frequency, and this can have an adverse effect on both Wi-Fi and Bluetooth as they operate on this frequency.
If you are finding that a device is causing problems, here are some things you can do:
Use high-quality cables. Cheap cables may lack the shielding required to prevent radio interference from leaking.Use high-quality USB 3/USB-C devices. Cheaper devices can cause more problems.If you are not using a USB 3 device, unplug it and turn it off.If your device has a long cable, move it further away from your computer.Try connecting the device to a different port (which may be further away from the Wi-Fi/Bluetooth antenna in your computer, and improve the connection).Shift your Wi-Fi installation to the 5GHz frequency instead of 2.4GHz (not all routers and device support this). This has no effect on Bluetooth, which always uses 2.4GHz. Reduce other 2.4GHz interference by moving away from devices such as microwave ovens, cordless phones, and baby monitors.If possible, move your router (or yourself) to a better spot to get a better signal.
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