The proposed fix - i read about it here https://forum.fairphone.com/t/no-sound-50-of-the-time-in-calls-until-reboot/53348/264
I thought long about what to write about the support (i assume the individuals working there are trying their best) so only mentioned the possitive.
An ethical and working option would be my priority, but if can only chose one - its either working or none at all. Whats the point of having a non-functional ethical phone. (and yes i know i am exaggerating, but just to make a point)