Pixel is the first phone made by Google itself, and the device received plenty of positive reviews and commentaries since its arrival. However a recently uncovered issue with one or more of the microphones is souring the experience for some users. The problem causes a total audio input block on a call or while recording a video with the camera app. The Google Support Forum was flooded with complaints about microphone failure of Google Pixel and Google Pixel XL devices. According to a lengthy breakdown by Google employee, both phones have a failure-causing physical default in one of the...
Source: http://www.gsmarena.com/pixel_and_pixel_xl_have_trouble_with_microphone_no_easy_solutions-news-23873.php