I have had to cut the top out of the cover around the noise cancellation microphone. I cut about 15mm off it.
I found this helped straight away.
Just looks very average with the top cut out.
When im on call to anyone they hear there voice echo but on my side it sounds fine. Its driving me mad i can hardley phone anyone because it echos constantly.
Is your device paired to any Bluetooth devices or audio systems when you are experiencing these symptoms?
Are you using the stock phone app when you are experiencing these symptoms?