My MacBook Air M4 keeps losing Wi-Fi connection

Wi-Fi Radio Signals from your Router fall off as the cube of the distance. Provided you are close to your Router and have clear line of sight and no competition from neighbors' Routers or known interference producers like microwave ovens.

All others need to do a more careful analysis to find out what is happening.

Wireless diagnostics:

Hold down the Option key while you click on the Wi-Fi icon on the menubar to open up the tools for investigating and fixing Wi-Fi issues

First is "Open Wireless diagnostics", which opens the wireless diagnostics Assistant, but does not proceed.

There are about eight different things you can do from here, but the top-level is to choose Diagnostics off the Window menu, or simply click continue, to do a quick check for Gross misconfiguration or operating problems. Your Admin password will be required. If any recommendations are shown, you should consider then seriously.

Next is to hold down the Option key and click the Wi-Fi icon as before. The screen that opens shows operating parameters of your Wi-Fi network. Screenshot, transcribe, or photograph the results and post back in a reply on the forums. Looks like this older one.

For macOS Ventura or later: 

1. Click the Apple menu () in the top-left corner of your screen. 
2. Select System Settings. 
3. Click Network in the sidebar. 
4. From the More pop-up menu, choose Locations > Edit Locations. 
5. Click the add (+) button below the list of locations. 
6. Type a name: for your new location (e.g., Work, Home, Mobile) and press Enter. 
7. Click Done.

• Switch: to the new location using the Location pop-up menu to start configuring your network settings, such as IP addresses, DNS, and proxies for that specific environment. 
• Your new settings are saved to that location, and your previous location's settings remain untouched, letting you easily switch between them as needed

While you at it

Check for Wifi connection >> Details

If using " Private Wifi Address "

Either Turn it OFF or change it from Rotating to Fixed

Running a 2 M4 machines

One of which originally arrived with Sequoia 15.0

Wifi was intermittent although it was 3 meters ( 6 feet ) from the Fibre Optic Router and in a direct line of sight

Making that one small adjustment changed everything back to 1 GB Down and Upload speeds

Steady connection and not drop outs

Creating a brand new "location" is THE way to walk away from any problematic network-related settings and begin anew, PROVIDED you create NEW named 'Location' and do not just take 'as configured'. It starts from an essentially blank MacOS default settings, and you can make changes for there.

So that is the "set all network settings to defaults" user crave.

Ok, the point being " I even had Apple check it at their Genius Bar, and no problems were found. "

It would be reasonable to conclude the issue is not the computer itself nor the Wifi connection made at the Apple Store

You might be right in regards to the AT&T wifi from the Router and / or " 3 wifi extenders "

Perhaps if you are willing to take the advise from @Grant Bennet-Alder and post back the info requested ?

rexadams wrote:

Thanks for all of the details, but I have never, ever had to set up a new location, nor mess with IP addresses, DNS, or proxies. I am not a network programmer. Every freaking item in my house connects with no problems with the exception of my MacBook Air.

I even had Apple check it at their Genius Bar, and no problems were found.

It must be related to some type of interference with my AT&T wifi.

An after thought if you would

Perform 2 tests,  as suggested by my colleague.

One is when the computer is adjacent to the Router

Be sure to clearly identify this in your Screen Shot

Perform the same Test when the machine is located in the problematic location of the house 

Post back both screen shots

This may or may not help identify if there is an issue coming from the Router to the computer or,  is the issue is from the Router to the Extender and onto the computer 

So, you were unable to make a new location?

As suggested by @BDAqua

Click on where the arrow is pointing

Yes, it not an obvious thing to be looking for but it is there

This should present the Fly Out menu they have referred to

🦉

Sorry to read the computer is still experiencing this issue @ home Only

As for the last suggestion to Edit Locations

That is best answered by my colleague