Sunday maybe you can help me. (I don't know your real name!)
With the RCD310, when I engaged reverse, the radio would mute but come on once I started driving at over 18 kph when the doors also locked. Now when I engage reverse, the RNS510 does not mute. The screen says optical parking sensors etc but the radio stays on. I have F/R 'acoustic' parking sensors but nothing optical. Wierd.