MacBook Pro 2016 - WiFi unstable/unusable

Routers that you name uniquely will compete rather than cooperate. If you give each Router and Repeater the same network-name and password, they will cooperate and allow your Macs to automatically choose the strongest connection, even if you move around (a "Roaming Network"). And if you name the 2.4GHz and the 5GHz with the same network-name as well, it will allow your Macs to hop bands to get a better connection.

Best channel selection in that case is "Auto" as it will sniff the airwaves at Startup and choose the least busy channel.

Routers send out a "poll" (request for any station that has a message to respond now).

Hi,

If it didn't work fine with other devices, I'd be pretty sure it was the cabling to the modem, and/or the ISP itself.

See if you've tried everything here: https://support.apple.com/en-us/HT202222

dgrescho-

Awaiting a fix.

There is no fix forthcoming, because Apple does not believe there is a systemic problem, and you have not shown them your sample of poorly-performing MacBooks so that they can treat this as a "sample defect" and fix it for you.

If you are in the US, your appointment at the genius bar of an Apple-owned store is free, in warranty or out.

If you can reproduce the problem on demand, a technician of any competency can swap parts until it is fixed.

This applies to the 2016 and 2017 MacBook Pro models, which have USB-C ports.

Why do I have difficulty with Wi-Fi or Bluetooth devices when USB 3 devices are attached to my computer?

Some USB 3 devices can generate radio frequency interference that can cause Wi-Fi and Bluetooth devices operating in the 2.4GHz band to have issues communicating with your computer. Here are some tips to avoid this issue:

• If your USB device has a cable long enough that you can move the device, place it away from your Mac—and make sure not to place it behind your Mac, or near the hinge of its display. The antennas for Wi-Fi and Bluetooth are located there, and USB 3 devices placed there might interfere with your wireless connections.
• If you're using adapters or dongles on a Mac computer with Thunderbolt 3 (USB-C) ports, plug them into the front port on the left side of your Mac, or into the ports on the right side (if your computer has them). These ports are the farthest away from the antennas, making interference less likely.
• To avoid interference on the 2.4GHz band using Wi-Fi, try using the 5GHz band instead. You can change this on your wireless base station. Bluetooth always uses 2.4GHz, so this alternative isn't available for Bluetooth.

from:

Using USB devices with your Mac - Apple Support

also, any of these items may be involved:

• Power Adapter cable recall

Apple USB-C Charge Cable Replacement Program - Apple Support

• firmware update for the Apple Multi-Port display adapters (specifically to reduce interference).

About the USB-C Multiport Adapter Update 1.0 - Apple Support

• LG-display recall -- to address Wi-Fi interference so severe, it knocks the Router off the air if too near the Router.

https://9to5mac.com/2017/02/03/lg-fixes-wifi-interference-problems-with-ultrafin e-usb-c-5k-display-new-units-unaffected/

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