voice is "falling" to speaker

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Aug 22, 2016 6:35:47 PM via Website

My phone is Xiaomi redmi note 2
In the last few days, I noticed a problem

When I’m talking (phone or buetooth car kit) after few seconds the sound is going to the speaker. The status signal still shows the original earphone/ bluetooh, but the voice is on the speaker.

After swiching to the speaker & back it’s OK, but meanwhile it’s annoying.

1- why is it so?
2- how do I fix it?

Other ideas?