I have an Echo for the past year and everything has been great until a couple of days ago.
It appears the proximity switch isn’t working correctly. when I put my face to the phone to answer or make a call, the earpiece speaker doesn’t work. II cannot hear the caller & they cannot hear me. And the screen stays on (while holding phone to my face).
if I use (wired) ear buds & with a microphone, it is fine.
I tried removing the screen protector, and also cutting a portion of it off.