Galaxy S7 echo during calls with speaker

Hi there,
I’ve been using /e/ on an S7 for a year now and I’ve had the same problem with the loudspeaker echos.
Also, phone calls are very hard to hear when there’s background noise, because I cannot up the volume to a level needed. A friend has the exact same phone and I can hear the callers on his phone standing next to him. With my phone I cannot hear callers well without really pressing the phone against my ear and sometimes that doesn’t help either. I have good hearing, btw.
Since calling is one of the most basic funtions in a phone, it would be greatly appreciated if this could be fixed with the next update. Thanks a lot in advance.
Cheers