Howdy. I’m using a AVH-W4500NEX. When placing a call with CarPlay, the caller hears their own voice with a horrific echo. I can’t figure out how to make this go away. 
 

It does it on any iPhone I try with it. I’ve tried with wireless CarPlay and USB (WiFi and Bluetooth shut off on my phone). 

My phone has been set back to factory settings. It doesn’t help.

Could this just be a bad unit? I was thinking of swapping it for the same model.