A connection that drops is three different problems wearing one symptom: the Mac, the router, or the service coming into the building. The order below separates them, and it starts with two tools that are already on the machine and that almost nobody opens.
First: the recommendation the Mac may already have
Click Wi-Fi in Control Center or in the menu bar and look for an item called Wi-Fi Recommendations. If it is there, the Mac has already detected something and is offering to tell you what. That is the cheapest answer available and it costs one click.
Apple notes the limit: this does not appear for personal hotspots or for networks using enterprise security, so an office network may simply not offer it.
Second: Wireless Diagnostics, which does not change anything
This is the one worth knowing about. Quit your open apps, hold the Option key, click the Wi-Fi status menu, then choose Open Wireless Diagnostics. Apple documents it in its page on Wireless Diagnostics, and the important detail is that it does not change your network settings. It looks and reports.
Apple suggests it for the case where you are connected and things still fail: pages that will not load, mail that will not send, video that stalls. When it finishes you get a list of what it found.
Third: restart, for a reason that is not superstition
Restarting the Mac is on Apple's own list in its page on a Mac that is not connecting to the internet over Wi-Fi, and the reason is specific rather than magical: on restart the Mac renews the internet address it was given when it joined the network. A bad or expired address produces exactly this symptom.
Two quick checks belong here too. Confirm the date and time are correct, because a wrong clock breaks secure connections in ways that look like a dead network. And if you have a VPN or security software, that software sits between you and the connection by design.
Fourth: separate the Mac from the router
This is the step that decides who to call. Connect the Mac to a different network, a phone hotspot will do, and see whether the problem follows it. If it does, the Mac is the suspect. If it does not, the router is.
On the router side Apple's advice is to install the latest firmware from its manufacturer, and that restarting it may be enough on its own. If a second device on the same network drops at the same moments, you have your answer without touching the Mac at all.
If the menu is not where this says
Older versions of macOS keep Wi-Fi in the menu bar rather than in Control Center, and the Option key trick works the same way there. If the Wi-Fi icon is missing from both, it can be switched back on in System Settings, under Control Center.
What this does not fix
None of this helps if the service into the building is down, which is why the test against a second network is worth doing before any of the longer steps. It also will not fix a room the signal does not reach. That is a physical problem, and moving the router or adding a second access point is the answer, not a setting on the Mac.
The same symptom on a phone has a different shortlist, because a phone roams between networks and a desk Mac does not. Wi-Fi that keeps dropping on an iPhone covers that side, and the test that separates your device from your network is the same one in both.
Last updated October 23, 2026