Voice guidance does not work

Both the free voice guidance and advanced voice guidance options do not work appropriately. They cut out part way through the directions. It makes it unsafe to be looking at the road and the phone for guidance. What I liked about this app was not only the interface but also the voice guidance via my cars Bluetooth but its not working. I also purchased the op-out for ads; seems that the only thing I paid for that works. Have written Navmii for guidance.

Woodland_ranger about Navmii Offline GPS Canada, v3.4.2