XA2 Outgoing audio

I have a new (secondhand) xa2 running sfos 4.0 and now 4.1. It happens very frequently that people cannot hear me, or only very faintly, or intermittently. But if I ring back the line is fine. Incoming audio is always good. This is so annoying that I’m considering going back to my xa2ultra which never had this problem. Other threads on the forum deal with call audio in general, so I don’t know if I should try jovirkku’s fix in this thread: [] XA2 phone calls no audio. It doesn’t help that the signal is erratic in my area and the walls of my house are .5m stone. TIA for any tips.

There is no known working workaround for [] XA2 phone calls no audio