Got a new Elephone P9000 yesterday, updated to latest OTA (Elephone_P9000_20160419). The Sound has very bad hissing static noise on the microphone. Listen to these: https://soundcloud.com/websitedoctor/sets/elephone-p9000-recording-background-noise and view this video: I'm happy with the device otherwise, but this is a showstopper. Is this likely to be a hardware issue or software issue? Any suggested fix?