A widespread issue is currently affecting Google Nest smart speaker users' ability to control groups of lights via voice commands. Reports indicate that the 'Ok Google, turn on the lights' command, specifically for controlling multiple lights in a room simultaneously, is failing for many. The cause of the outage remains unclear, and Google has yet to release an official statement or timeline for a fix. Users are advised to control individual lights as a temporary workaround until the group control functionality is restored.