mamsafrasYes, this just happened to me a few minutes ago. Such a cheap device.
The same issue i have also and i raised this issue to Asus Support. They given the steps that above mentioned , even not fixed. We need proper solution for this @Christine_ASUS and @Y_ASUS . This issue happen while talking only means when mobile away 2" from face people in other end they keep complaining that they cannot able to hear my voice properly. If i use earphone there is no issues to hear in other side