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Prevent Windows 10 laptop from disconnecting from Wi-Fi when OS is locked or lid is closed

What steps need to be taken to prevent a Windows 10 laptop from disconnecting from the Wi-Fi when the OS is locked or the lid is closed while the laptop is plugged in with a power adapter?
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I need to make sure this doesn't happen on the two laptops that I use the most often, Lenovo T450 and Lenovo T440.

The problem is that I take these laptops with me to customer sites where I don't have docks available.

All Lenovo and Windows updates are installed on these Lenovos.

Are there any special settings or configurations to make sure this doesn't happen on Lenovo laptops running Windows 10?
As you describe, you cannot. Won't work. No dock, and suspend will temporarily disconnect the wireless and reconnect on resume. I do this daily and have done for years.

There is no issue disconnecting while suspended.
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It will still suspend transmission with the lid closed and machine suspended.
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Andrew,

Yes, the setting you have described is already enabled.

Furthermore, the laptop is set to never hibernate, go into standby or shut down while plugged in after any amount of time.

Also, the Wi-Fi power management setting found in computer management is also set so that Windows is never allowed to shut off the device to save power.

Also, all BIOS, firmware, and Windows 10 updates are installed.

What else can be done to fix this issue?
IT Guy, based on the information you just gave, nothing else can be done. What model laptop do you have anyway? Those steps work on my Acer Windows 10 laptop?!
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I take these laptops with me to customer sites

That means you either suspended the laptop (or less likely turned it off).  

When you close the lid and suspend without a dock, wireless quits as well. That is the way it works. And then wireless comes back on as soon as you open the lid and start to work.

All covered in the first answer here.
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We have seen some issues with the computer getting to warm if the lid is closed with the computer running full tilt. So I always prefer to suspend.

IT Guy - you close the lid on a laptop and pack it in your bag to go the next place (so you said earlier). Why does Wi-Fi need to be connected as it will change anyway at the next place?
Thank you IT Guy