There is an echo on the receivers end during phone calls

When I talk to someone on the phone, a Sony Xperia 10 II with SFOS 5.1.0.11, with the speaker on, the person I talk to hear echoes and a generally bad sound, that disappears as soon as I switch the speaker off. Sometimes the sound is good at first, but suddenly during the call the sound in the other end becomes bad.

Does anyone know what is causing this?

I’ve got the same complaints on Xperia 10 iii running 5.1.0.11
Feels random, or maybe some of my friends just complain more than others

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Both my brother and my son complained on the sound, when I was on speaker.

If I remember correctly, on Sony Xperia 10 II with speaker on people get echo, and I don’t remember if it was only sailfish problem or Sony android too.

Some times that this happens when I am on call from speaker on or headphones, and the receiver gets an echo, I terminate the call, restart audio system from utilities and call again.

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Okay, I will try restarting and see if it helps.