Many Pixel and Pixel XL owners have been reporting a huge problem. They are experiencing failing microphones. When your phone's microphone fails it is essentially useless for important things like phone calls. The cause of this issue may have been identified by Google employee Brian Rakowski who says the issue may be caused by a hairline crack in the solder of the microphone component going to the main board. This causes the primary phone input and two ambient mics to not work properly.
Even though this is a widespread problem, affecting 1% of users so far, Google has not announced a recall on the devices. Instead Google's support team has been instructing users to send the phone back and get a new one under warranty replacement. This is a bit concerning though because if this is an issue in the manufacturing of the phone it means that other device will go bad in a matter of time possibly after the warranty has expired at which point there will be no way for users to get a replacement device. The Note 7 had issues with far less than 1% of devices and was forced to issue a recall and eventually discontinue the sale of the Note 7. It will be interesting to see if Google gives an official response to this hardware issue with the Pixel and Pixel XL.
via Google Support Forum