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Helpful answers
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Oct 2, 2016 11:10 PM in response to Obsidian_Jiangby K Shaffer,You could set up a second user account to use as troubleshooting, & see
what may be different about your admin or main user account; especially
if the second user account has no similar issue or problem with wi-fi.
There is a macOS utility to help diagnose wireless internet connections in Sierra.
•How to use Wireless Diagnostics to help you resolve Mac Wi-Fi issues ...
www.appleworld.today/.../how-to-use-wireless-diagnostics-to-help-you-r...
Feb 2, 2016 - How to use Optimized Storage in macOS Sierra
•Check for Wi-Fi issues using your Mac - Apple Support
support.apple.com/en-us/HT202663
Not sure if the Console utility log files could be helpful to diagnose this
issue of disconnect during sleep. The system constantly generates logs
and so there are countless thousands in the course of a year. The Day
and Time (plus seconds) are an essential part of the log. That much is
the easy part; the rest amounts to another language most don't know.
You can select from the antenna icon in the upper right Finder window
to see the network preference settings, and also can have macOS X
remember the visited wi-fi networks; how these settings are configured
can make a difference in the result. Not knowing what yours are set on
is where you have to try and toggle some, to see if they help; then if not
move them back to previous settings; as some are default.
These settings are in various locations in the macOS, some right on the
desktop, others in system preference network panels. You can toggle
the wi-fi off and on, to see if that makes a difference. Actually, a restart
to Safe mode (shift key held, after start tone, & until you see login) may
help the system check & fix some files. When done, restart normally.
In this safe mode, wi-fi may not work. The full system isn't booted.
• Try safe mode if your Mac doesn't finish starting up - Apple Support
• Manage the Wi-Fi connection on your Mac - Apple Support
Of this, most seems basic to me; helps to go through the setting
and re-set them again. Change from what they are, save, then go
back to the one you wanted. Even if it was already set. In some
instances, the 'repair permissions' in Disk Utility may help, but it
also may be sketchy as to if it really did. But it cannot hurt.
Sometimes interference in the location of your wireless network may over
power the signal and the Mac won't see that on restart. If the base station
or wi-fi, router AirPort, etc is near a stronger signal such as microwave oven
and or some cordless phone frequencies, these can stop wi-fi from working.
•Troubleshooting AirPort and Mac Wi-Fi problems | Computerworld
www.computerworld.com/.../troubleshooting-airport-and-mac-wi-fi-p
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If the wireless network at some other location works OK (at Apple Store or
a safe internet café, or a library, etc) then you may want to look into the
local environment for interference sources. Other electronics that emit a
signal near the wi-fi band of your wireless base. Also if you have an AirPort
with Dual Band read about how to test & reset it; you can choose what items
use one band or the other in some cases. Otherwise it may be automatic.
• Resetting an AirPort base station FAQ - Apple Support
• AirPort + Wi-Fi: AirPort Base Stations - Apple Support
https://ssl.apple.com/support/airport/basestations/
My AirPort wi-fi base stations are older models, and generally just work.
Could be if your base station has a pending firmware update, read up before
you apply because some software updates only make troubleshooting harder.
At times, some peripherals connected to the Mac can affect Wi-Fi. Some of
the newer USB3.1 and or Thunderbolt items may affect the wireless. Test by
disassociation; this may or may not provide more clues.
In any event...
Good luck & happy computing!