Here are some steps you can take if the Embr Wave mobile app won't stay open.
The solution is simply to switch your phone's Bluetooth off and back on again.
Here's something you can try: 1. From your phone's Home screen, open Settings > Bluetooth, and toggle it off. Now toggle it back on. 2. If you want to turn Embr Wave off, you can press the center (or both sides) of Embr Wave's light bar.