This is a strange bug. I just upgraded to version 3.0.3 via Hass.io and noticed I'm getting a not connected error using the call service node. When I deploy a flow it tells me no connection and shows the "Call-Service attempted without connection to server." error. Once the service is called it (inject or normal flow) the node works as expected and status turns green called at: date. This only happens when triggering a group to turn_off. If I change the service to turn_on, it connects as expected. I have many other turn_on/off using switch/light, but this only happens when the Entity ID is a group. Any ideas what would cause this?