JVC car audio bluetooth dropouts - Galaxy S 4 Q&A, Help & Troubleshooting

I have a JVC KD-R821BT bluetooth car stereo paired to my S4. Everything is paired up fine, but when playing audio from the phone through the JVC unit there are frequent drop outs - i.e. a 3-second silence every minute or so. It happens with any app (e.g. Google Play Music, BeyondPod).
I don't have this problem when using the phone with a Parrot Mki9100 in our other car, so presumably the issue is related to the JVC unit.
Has anyone else had this sort of problem??

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TomTom audio via Bluetooth

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[Q] Bluetooth and Multiple connections

Hello.
I am using my S4 in car.
It connects at same time to my car hands free (Audi MMI) with Call Audio profile and it connects to my A2DP Music receiver (connected to my car IPOD cable) using A2DP profile.
This dongle supports also Call Audio profile but I have paired it using only A2DP.
Connections are good and phone always connect to both without connection issues.
Sometimes (often) when it is connected to both devices, music and sound stop playing (the player is going on with playing and with time counter but I can't hear any sound from car or from phone speaker).
If I disconnect car hands free, music starts playing from car audio speakers.
If I reconnect car hands free again, music stops playing.
When this happen, the only way I found to solve is to restart the phone and then all is ok (phone hands free and music streaming).
I have the problem with 4.3 but it was the same also with previuos 4.2.2 android version.
I think it is a phone problem since restarting always solve it.
Someone had the same problem or has any advice?
Thank you
Chris

Bluetooth media playback suddenly broken

I was playing a video podcast on my JVC car stereo via bluetooth earlier. After stopping for 5 minutes I started the car again, waited for the phone to reconnect to the car stereo bluetooth , then resumed playback of the podcast. This time there was no audio playback through the car stereo, and I couldn't do anything to get it to work again. I tried rebooting the phone (twice) but despite appearing to connect successfully to the JVC unit there is no audio playback.
Can anyone suggest anything else to try? I'm running Phoenix ROM v9.4 (Android 4.4.2).

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