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My MacBook Air has issues maintaining an internet connection at home. I think my access point is at fault, as this also happens to other devices.

Reconnecting to the WiFi or running Network Diagnostics fixes the problem, only for it to happen again 5 minutes later:

Network Diagnostics

How would I diagnose the problem? Are there any tools that would tell me what/where the problem is?

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The key to your diagnostics is this statement:

I think my access point is at fault, as this also happens to other devices.

When you have multiple devices exhibiting the same behavior, the best course of action is look for the common thread - in this case your WAP (Wireless Access Point)

You never mentioned what wireless router you are using, but it's probably a safe bet is a consumer grade unit. I experienced the same issues until I finally ditched that gear and went for more commercial grade equipment.

In your case, even if you didn't want to replace the router itself, you could disable the WiFi functionality and add in "proper" WAPs as described in the linked answer.

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Click the WiFi icon in the menu bar while holding the Alt/option key then choose "open Wireless Diagnostics". Another option: download WiFi Scanner (Mac AppStore) and see the information panels.

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