Radio-frequency interference from USB 3 peripherals can cause problems with Bluetooth and 2.4 GHz Wi-Fi.
networking
How can you tell whether your Mac supports Continuity, whether you bought an app from the App Store, and diagnose extension problems?
Further suggestions for setting your router up, to keep your local network safe, secure, and free from trouble.
Apple announced in June 2015 that OS X 10.11 and iOS 9 would support extensions to better deal with network congestion. What happened?
Half the time I start my iMac up, it reports that something else is using the same IP address. How can I fix that?
Does it help to unplug your network connection when checking suspicious email?
How does creating a new location in the Network pane solve network lockout problems?
Periodically, my MiFi dumps my Macs off the Internet connection. Why?
Why is my iMac’s Bonjour name already in use when I have only just started it up?
Having redundant Internet connections is a good idea, but you must only have one DHCP server.
The Eclectic Light Company 