Its the microphone or rather, the noise cancellation algorithm. We're hoping the next update fixes it

Sent from my Nexus 5 using Tapatalk
Always read the OP's of a thread and the last 2 pages before asking questions, unless there has been an update - in which case, read the last 5 pages!

nexus 5 | SlimKat | ElementalX kernel | Philz Touch Recovery

I do NOT reply to support queries over PM.