A key feature of bluetooth audio is the ability for multiple apps to be able to output audio. Such as when you have your music player stream via bluetooth, and a navigation app (like Google Maps) speaking turn by turn directions. As some folks have laws requiring hands free usage in cars, this is a significant Bluetooth bug. In the recent past, about 2 months ago, this feature was broken by an upgrade to Poweramp I believe. The issue started when I had Android 4.4.4. I now have Android 5.1.1 and it persists. Now when I use both Poweramp and Google Maps Navigation, The music will go silent but no sound is played by Google Maps Navigation. Since this issue does not occur if you use any other media player, it is clear that the issue lies with Poweramp. Device info: Nexus 5 OS: 5.1.1 stock (issue seen since 4.4.4 stock) Bluetooth connection to car radio (stable since setup in December 2014) Poweramp application installed and setup with bluetooth output (any version released in the past couple of months, including the current as of June 18 2015) Any navigation application that has the ability to output sound over bluetooth, such as Google Maps or Waze. Issue: Poweramp prevents other apps from playing sound via Bluetooth audio. This previously worked fine. (early 2015) Workaround/ Temp Fix: Do not use Poweramp as your music player. Google Play Music and Amazon Music both work fine. Test cases: Works: 1. Open Google Maps Navigation and configure to play audio via bluetooth 2. Open Google Play Music and configure to play audio via bluetooth 3. Play music via Google Play Music. 4. Start navigation via Google Maps. 5. Notice that audio successfully switches between the 2 apps, and you can hear audio from both apps successfully over bluetooth. Fails: 1. Open Google Maps Navigation and configure to play audio via bluetooth 2. Open Poweramp and configure to play audio via bluetooth 3. Play music via Poweramp. 4. Start navigation via Google Maps. 5. Notice that audio fails to play the audio for the navigation app, instead you hear a gap in sound from the music player app. You cannot hear audio from both apps successfully over bluetooth. Suspected issue: Poweramp does not relinquish access for other apps to play sound. Perhaps Poweramp forces the sound to be "nothing", instead of relinquishing control.