[Q] Stop being heard during call

I've been having the following problem since yesterday: when I make calls or I'm being called, after some random period of time, the other party stops hearing me. Now this happens either with the headphones (the JBL 1+ ones) or without them. If I'm with the headphones, they completely stop hearing me and if I'm without them they hear me like a robot. I thought about putting the phone on speaker, and in the case of having the headphones attached nothing happens, and in the case of not having the headphones the call quality is restored.

So it's not like I have found any pattern. I thought about reflashing the latest firmware, but it didn't work.

Any ideas would be really helpful.

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