It is necessary to confirm whether there are other power control devices in the activity other than the projectors. Can other devices be shut down normally? 1) If there are other devices that can be shut down normally, the projector's shutdown command may be disturbed. Please try to adjust the command sequence of the activity shutdown sequence edit -- watch Fire TV edit -- shutdown settings, find the projector shutdown command, press and hold the icon on the left, move the command to the top, save and exit. This modification will turn off the projector first to avoid interference from other commands. 2) If only the projector in the activity needs to be shut down, the projector does not shut down, which may be because the hub does not receive instructions from alexa, or it may be caused by inaccurate speech recognition or unstable network. Please repeatedly shut down the activity. Generally, Google assistant will reply OK or similar confirmation instructions, and the control command is effective.