I had this problem since the moment i've bought the phone so it persists on all firmware, now im using latest version, i've reseted phone to factory defaults, it not helped. My problen is this, and it seems what many more people are experience it, than i use stock asus apps, recorder and phone, everything is ok with sound recording and mics, it is clear and loud, but then i use 3rd party apps, or google apps sound quality drops dramatically, all my voice messages are very quiet and in poor quality, this also happens than i use loudspeaker on truecaller app, or any other 3rd party caller app, Recently i discovered what non asus apps use only upper mic for some reason, so that is the reason why sound recording quality is so poor. I've check my board mics status, they all are working fine, so i guess it is a software problem.
I contacted asus support, and do every stupid basic step they told me to do for a month, nothing helped, so now i want to ship my phone to service center, and if problem remains, i would just sell this phone and dont ever buy any asus phone in future. It is a very expensive device and it cant do its main phone job, such a dissapointment.
