I got 17.3.2 yesterday. Installed and took it for a quick drive. It was a clear bright day, TACC worked great and even had the chance to do 45mph on the highway and kick in Autosteer. While it was only for a minute or so, it worked great too.
Later last night and this morning I had the opportunity to try Autosteer again (yes, under 45MPH and on the same highway) and received an error "Autosteer is temporarily unavailable". I rebooted and tried again and still the same message. The only thing that really changed is that the sun went down it was a little foggy / misty. Could the dark / slight weather have caused AP to stop?
To be clear, I've seen three Autosteer errors. This wasn't the "You're going too fast" or "Not available on this road" error (I've seen those too). It was a Temporarily Unavailable error. Has any else experienced this?