Connected to an AVM Fritz!Box on 5 Ghz by chance?
If you are in control of the router, try standard “802.11n+a” instead of "“802.11n+ac”. Furthermore make sure that the 5 GHz channel isn’t set to 116 or higher, Fairphone 3/3+ as well as other devices don’t like that, at least with Fritz!Box routers … https://forum.fairphone.com/t/my-fp3-doesnt-like-higher-5ghz-wifi-channels-especially-channel-116/54710
But this is general, shouldn’t be bound to a specific Fairphone OS or /e/OS version so far.
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