Are you using a case on your phone ? If so what kind ? If you aren't using a case are you making sure the mic on the phone is near or pointed at you mouth ?
....or a poorly placed screen protector that is partially blocking the mics at the bottom of the screen.
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Interesting you said that restarting the phone sometimes correct your issue . You may want to try doing a factory data reset . Sorry I got nothing else .
That works wonders at times for other little glitches...add one more to the list. Thanks for posting. FWIW, my hearing is far from normal & my Turbo is louder than I actually require - I can hear OK in normal situations with the phone not touching my ear at all.Update....I went online with Motorola for my complaint. He had me clear cache in the boot menu. Problem resolved so far.
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