New release is out: 1.20.0
I have worked on voice prompt cache that should improve stability of voice prompts (less should be missing). Also, if you start navigation with voice prompts, there will be a message on start allowing you to get immediate feedback on whether sound is working as it should.
Map center and position marker transitions are made smooth during navigation. Let's see if it causes any major issues in use (too slow hardware, too fast discharge of battery). Right now, you cannot toggle it on/off. If it works for all, we keep it just enabled and no extra toggle is needed.