My Enphase app says the gateway is not reporting - what should I do?

Short answer

'Not reporting' usually means the IQ Gateway (Envoy) has lost internet, not that the panels stopped. Check the gateway's network LED (solid green means connected), restart your router, make sure the gateway's breaker is on, and reconnect it to Wi-Fi in the Enphase App. The gateway stores production data and uploads it when the connection returns.