I have the same issue (Dasaita 10.2" running Android 10) and the only way to bring it back is to hit the microphone/voice button 2x quickly. It's been this way for a long time. At least we can fix it without getting a txt message.Im not sure if this is the right place for my question, but i got help in here once before. I have an issue while using my head unit with Android auto. Sometimes when i get notifications, my volume gets low. I've found that if i hit the Google microphone button, it will fix the volume. In looking for a solution, i found a YouTube video with the same issue. I hope it's ok to post this link. I'm not totally familiar with the rules here , but this is it-. Any help would be appreciated. Thanks.