Person on the other end of calls can't hear me

I've got a newish LG G5 here, which has been fine up until a few days ago when suddenly people started complaining they couldn't hear me on calls.

When I talk into the G5, the caller on the other end hears nothing. If I literally shout into the phone they can just about hear faint snippets of speech. On my end I hear the other caller just fine. I'm also hearing a loud echo of my own voice in my ear when I speak. It happens this way around regardless of which party initiated the call.

I...

Person on the other end of calls can't hear me

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