Nothing kills your flow like a Mac that drops Wi-Fi every few minutes — video calls freeze, downloads stall, and you end up staring at the spinning beach ball. If your iPhone stays connected while your Mac keeps falling off the network, the problem is almost certainly corrupted wireless configuration files on the Mac itself. The fix is a clean Wi-Fi reset: delete the stale preference files, reboot, and reconnect. Here is exactly how.
How to fix a Mac that keeps losing Wi-Fi, step by step
- Turn off Wi-Fi. Click the Wi-Fi icon in the menu bar and toggle it off. This prevents macOS from rewriting the files while you work.
- Open the SystemConfiguration folder. In Finder, press Cmd + Shift + G, paste /Library/Preferences/SystemConfiguration/, and press Enter. (That is the system Library at the root of your drive, not the one in your home folder.)
- Delete these five files — drag them to the Trash; you will be asked for your admin password:
- com.apple.airport.preferences.plist
- com.apple.network.eapolclient.configuration.plist
- com.apple.wifi.message-tracer.plist
- NetworkInterfaces.plist
- preferences.plist
Do not worry — macOS regenerates clean copies on reboot. If you are nervous, copy them to your Desktop first as a backup.
- Restart your Mac. Apple menu → Restart. This is the step that actually rebuilds the wireless stack from scratch.
- Turn Wi-Fi back on and rejoin your network. Click the Wi-Fi menu, choose your network, and enter the password. Your connection should now hold steady.
If your iPhone has the opposite problem — Wi-Fi speed dropping or failing to reconnect to the router — those need their own fixes, since iOS stores its network settings differently. And if your Mac connects but picks the wrong network, check how to set network connection priority on macOS.
If it still doesn’t work
Still dropping after the reset? The issue may be on the router side. Restart your router (unplug it for 30 seconds), move the Mac closer to rule out interference, and try the 5 GHz band instead of 2.4 GHz. Apple documents wireless diagnostics in its Mac Wi-Fi troubleshooting guide.
Only one network drops? Go to System Settings → Wi-Fi → Advanced (or Network settings), select the troublesome network, and click the minus button to forget it, then rejoin fresh. A corrupted saved password or stale DHCP lease can mimic a dropping connection.
Drops started after a macOS update? Check for a newer point release — Apple has shipped Wi-Fi driver fixes in several updates, as MacRumors has reported — and reset the SMC/NVRAM on Intel Macs if nothing else helps.
Frequently asked questions
Is it safe to delete those .plist files?
Yes. They are just configuration caches; macOS recreates them automatically at boot with clean defaults. You will need to re-enter Wi-Fi passwords afterward, which is the point.
Why does this keep happening?
Preference files can corrupt during updates, hard shutdowns, or when switching between many networks. A periodic reset every year or two keeps the wireless stack healthy.
Five files, one restart, and your Mac should stay glued to Wi-Fi the way it did on day one.
