Default "other application already recording" which one??

Hi
sometimes some application is using my microphone for some reason (good or not), and block the access to the microphone to all other apps, making me unable to use any microphone application like voice recorder (I get a message "other application already recording"), soundhound, Ok Google, etc...

restarting the phone does help but temporarily.

I tried to see the "running application " to examine what application could that be but no luck! (I even froze S voice from Samsung).

Any idea how to find the culprit??
couldn't find anyone else with this problem...

applications I know I have that I use voice (and that I disabled to check, when possible ) : SwiftKey keyboard, S voice, soundhound, ringdimmer, Google now, Shazam)

Thanks for your help

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