Mac OSX Sierra drops Wi-Fi
Mac OSX Sierra drops Wi-Fi connection when system sits idle
macOS Sierra (10.12.4)
Mac OSX Sierra drops Wi-Fi connection when system sits idle
macOS Sierra (10.12.4)
What does Wireless Diagnostics show?
Wi-Fi Problems in OS X Yosemite
Wi-Fi Problems in OS X Yosemite (2)
Wi-Fi Problems in OS X Yosemite (3)
WiFi Potential Temporary fix - Yosemite
Also try turning off Bluetooth.
If your Wi-Fi source is capable of generating a 5 GHz Wi-Fi network, try that to help avoid conflicts with Bluetooth.
If you have done the above, and still have this issue, do following:
hold the Alt/Option key while clicking the WiFi icon in the menu bar: you get a very complete list:
with Shift+CMD+4 keys you can make a sceenshot of that list. Post it here.
Mac OSX Sierra drops Wi-Fi