If you’re one of the people who’s having trouble with Wi-Fi in OS X Yosemite, you’re probably pretty sick of toggling the Wi-Fi on and off. OS X Daily points out a better option.
When you Option+Click the Wi-Fi icon in the menu bar, you’ll get all kinds of info about your Wi-Fi network, but most importantly, you also get the option to disconnect. Just click that option and you’ll disconnect without completely turning off Wi-Fi, making reconnecting a little quicker.
Disconnect from Wi-Fi Network in Mac OS X Without Turning Off Wireless | OS X Daily