All my EspHome entities are unavailable and the devices show as offline in the dashboard

As per title, what should I check?

I see the fall back wifi networks are available when I scan for wifi on my phone

Well check your wifi :wink: It’s not working or got a time where it was not working so ESP switched back in AP mode !

My wifi is working, I have two networks, one created by the main router and one created by an access point hardwired to the router.
Ssid are different, 3 devices are set to connect to the secondary network and one to the main one. All 4 of them are offline. They will probably start working again if I restart both wifi networks; is there any troubleshooting I can do now in this state?

Well check in history of your ESPHome devices in HA when they disconnected ? I guess all disconnected at same time ?
Are your ESP setup with fixed IP or DHCP ?

And are you using the HA api or MQTT? Maybe your MQTT broker is down?

Api; I also noticed some other devices are unavailable (Shelly) and also my laptop (2.4GHz only) couldn’t connect to the WiFi
I have no other choice than restart the router