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Your Wi-Fi is sitting on top of your Zigbee
Both live in the 2.4 GHz band, and one Wi-Fi network is wide enough to smother four Zigbee channels. Tell me where your Wi-Fi is and I will tell you where to put Zigbee.
How to change it
Moving Wi-Fi is nearly always the easier fix. Your router changes channel and every device follows within seconds, because that is what Wi-Fi does all day long.
Moving Zigbee is not free. Mains-powered devices (plugs, bulbs) normally follow the coordinator. Battery devices often do not — they were asleep when the change happened, and you end up re-pairing door sensors one by one. If you do it, do it once and do it properly.
Zigbee2MQTT: channel under advanced in configuration.yaml, then restart and leave it an hour.
ZHA: you cannot change it from the interface — it means forming the network again.
Questions people ask
Why do my sensors drop only sometimes?
Because interference is not constant. A Wi-Fi network that is quiet at night starts streaming video in the evening, and that is exactly when the far sensors stop reporting.
Which is easier to move, Wi-Fi or Zigbee?
Wi-Fi. Changing the Zigbee channel usually means re-pairing devices that did not follow the change — routers tend to follow, battery sensors often do not.
What about Zigbee channel 26?
It is the furthest from Wi-Fi, but many devices transmit at reduced power there and some older ones do not support it at all. Great on paper, awkward in practice.
Does 5 GHz Wi-Fi interfere?
No. This is only about the 2.4 GHz band. If you can move your devices to 5 GHz, that helps too.