Android Auto disconnects are usually solvable once you isolate wired vs wireless. Start with cable/port checks for wired issues, rebuild pairing for wireless issues, and ensure battery optimization ...
Maybe it's just me, but I've had the worst luck when it comes to the reliability of Android Auto. I hate to say it, but my iPhone never has any issues connecting to Apple CarPlay in any car I've ever ...
Android Auto voice commands appear to be broken for some users in recent days, displaying an availability error on screen.