My robot no longer not makes any sounds

Your robot may simply have its volume turned down all the way, which will mute it entirely. To adjust the volume, try the following steps:

1. Open the Wonder or Blockly app and connect your robot.
2. In the top right corner, tap the picture of your robot. (It’s where the orange + was.)
3. You should now see a larger picture of the robot, and underneath an orange oval with gears in it. Tap the gears to adjust settings.
4. Turn the volume up down and back up again  and see if your robot makes sound now.