There could be several reasons why the audio on your Google Nest Camera keeps turning off. First, check if the camera's volume settings are properly configured in the Google Home app. Sometimes, the audio might be disabled or set to a very low level. Additionally, ensure that your camera’s firmware is up to date, as outdated software can cause functionality issues. If the problem persists, it might be worth resetting the camera or reconfiguring network settings, as a weak Wi-Fi connection can affect the audio performance.