DIAGNOSIS The camera has lost its Wi-Fi connection. This is often a router-side issue, not a camera fault.
FIX First, check your home router and internet connection. Restart your router. Then, power cycle the camera. Disconnect the solar panel cable from the camera for 30 seconds, then reconnect it. Wait 2-3 minutes for the camera to fully reboot and attempt to reconnect.
IF THAT DIDN'T WORK The camera's saved network credentials may be corrupted. Perform a reset. Press and hold the sync button on the camera for 10 seconds until you hear the prompt. You will need to set the camera up again in the Eufy Security app as if it were new.
HEADS UP If this happens repeatedly, ensure the camera is within a strong, stable Wi-Fi signal range. Obstacles like walls significantly reduce signal strength.