Replacing a new MacBook with major issues that are not getting any better ....

Hi, northcoastkitty, Apple's policy to to replace like.....with.....like....after 2-3 major repairs, which may not have been successful in solving your problem.... I'm glad you have AppleCare+ as that will help you out a bunch... as WheelieNick posted, and linked, have you tried following these steps, which I guess you did multiple times without success.. you could try deleting the Wifi Network and Location under system Preferences>>Network, then try to create a new Wifi Network, you could change your password if you wanted to.....OHH, and I found this: Apple Wireless Diagnostics, and as you're running Sonoma *(Mac OS 14) this should be right up your alley and help you out a bunch, anyways, see the link on what to do:Use Wireless Diagnostics on your Mac - Apple Support (CA) and give it a try..... you have an Apple Silicon Mac, which makes things a little tougher to troubleshoot, and fix (as the stuff that used to work on Intel Mac's doesn't work anymore), you could also try booting up into Safe Mode and see what that does: Start up your Mac in safe mode - Apple Support (CA), that's about all you can do for now....reset smc/pmu and zapping pram 3-4 times on startup doesn't work on Apple Silicon (M1 and M2) Macs....otherwise call/contact your local AASP (apple Authorized Service Provider) or local Mac Store with Genius Bar and take your MacBook Air in for an evaluation,(should be under "Mac Repair" on Apple's website) and see what they have to say..... The evaluation at an Apple Store with Genius Bar is FREE anyways....can't speak for an AASP at all...

good luck

John B

Try connecting the laptop directly to the router using an Ethernet Cable and USB-C to Gigabit Ethernet Adapter. If you also have a problem with a wired connection, then it most likely means your router is misconfigured. If it works, then you can focus on possible WiFi issues.

Try booting the laptop into Safe Mode to see if it works Ok. If Safe Mode works, then it means you have some third party software installed which is interfering with the normal operation of macOS. Usual culprits are anti-virus apps, cleaning/optimizer apps, third party security software, and VPN software. None of this software is needed on a Mac and they usually cause more problems than they solve. The only time a VPN is needed is when you are connecting directly to an employer's or business' VPN server to access their network directly.

If you are using any browser extensions or plug-ins, then disable them.

Try creating a new macOS user account. Log out of the main user account, then log into the new macOS user account. See if you have the same issues. If this other user account works, then it means the issue is local to your main user account....either a login item, or a configuration issue.

In my own personal experience supporting thousands of Apple laptops for over 20 years, it is extremely rare to encounter a hardware issue affecting WiFi connections especially on new hardware. Most times it is a software or configuration issue, or an issue with the router or the computer's line of site to the router/access point where the signal may be too weak or objects are blocking the signal, or an appliance may be creating too much signal noise. We definitely need more details including the WiFi connection information another contributor requested.

You may also want to disconnect & power off all externally connected devices in case one of them is causing a problem. USB devices are known to sometimes to interfere with WiFi signals.

It is very unlikely that by some coincidence, you made a mistake setting up your WIFI.

I highly doubt it's anything to do with the settings, in fact, it is most likely a hardware defect.

If you haven't tried Apple's mail in service, I had a good experience with them. They spot and fix--even small defects hardware or software. I don't know how Apple works behind the scenes, but it seems the best bet is to send it to them rather than use a in-store technician. Based off my experience.

Since you still have warranty with Apple Care you're good.

Send it in, it'll take around a week usually, they will most likely replace the WIFI card or even motherboard.

In addition to what WheelieNick has suggested, it might help if you could post a screenshot of your WiFi connection details. When you're Mac is connected and you know WiFi's working, hold the Option key down and click on the WiFi icon in the upper menu bar. Then take a screenshot of that.

To compare, you could do the same thing when WiFi isn't working (assuming you're still connected to your router).

Might be worth a look at both of those details.

have you tried following these steps: I guess you did multiple times.

If your Mac isn't connecting to the internet over Wi-Fi - Apple Support

if your MacBook is going to be replaced, it could be that you get a rerfurbed one but refurbished is as good as new, especially when Apple refurbed it