[Galaxy S 4 Q&A, Help & Troubleshooting] andydsm:
Hi everyone,

First off, I'd like to start by wishing to everyone happy Holidays!

I have been literally searching all over the Internet for any information regarding the issue I am about to describe in detail and since no solutiuon was found, there's nothing left for me to do but ask for help, and hopefully get the right answer. That's why I want to be as specific and informative as I can.

The problem I am having is this; I recently purchased a new Jabra Motion bluetooth headset and decided to start using the voice dialing function on my Galaxy S4, since it works very well (when it works) and is really a breeze, especially while driving.

In short, the problem is that the S4 completely loses audio (other party hears nothing as well) after initiating a call, via voice dial commands through any bluetooth headset (I'll get to that). When that happens, the phone has no in-call audio whatsoever (with headset on or off, with speakerphone or earpiece on), no matter how many times I start or receive a call and nothing brings audio back, except a reboot from the i9505's power button menu. All other audio works, like videos, unlock sounds, ringtone, music, even the little chirp right before the other party's phone starts ringing and the hangup chirp can also be heard. The worst part is, that it occurs completely at random, it can happen on the 1st time I voice dial or the 10th time, for example. The problem has not shown itself, when initiating a call normally or picking up with a headset connected, before audio gets lost.

Before purchasing the Jabra Motion I've been using an earliest model Jawbone Icon and had never even tried the voice dialing feature on any previous phones or the S4. After encountering this problem I tried to test whether or not it would happen when using that headset, the result was yes, so it is safe to say it will happen when using any bluetooth headset, with the same randomness.

This is what both headsets launch on the phone, when attempting to voice dial:

View attachment 2474439

The phone itself is a completely stock and un-rooted 16GB Galaxy S4 i9505, running the latest available Jelly Bean 4.3, build: XXUEMJ7.

The headsets are always connected to 2 devices simultaneously (in case that might shed some light)

What I've tried so far (no difference made, at all):

- Toggled bluetooth off and on

- Tried unpairing and re-pairing both headsets on both phones, or only on i9505

- Tried factory resetting both headsets

- Tried to toggle, while in call, between speakerphone, earpiece, headset, turning off headset and all possible combinations

- Removed Jabra companion app and services app, then reinstalled, then tried without the apps installed.

- Cleared cache from both Jabra apps.

- Cleared cache from system apps such as dialer, bluetooth and Google Search.

- Contacted support of both Samsung and Jabra (huge waste of time)

Sorry for the very long post, but I want to be clear and comprehensive as possible. Any help would be highly appreciated.

Please no factory reset suggestions, I am aware of that possibility, but do not want to go through all the trouble to set up tons of apps and stuff again.

Thanks in advance to anyone willing to help!