Also having the same issue.
And if I read al the messages correct, there is still no solution. And there a people who are changing the subject.
PROBLEM
When on speaker, the microphone isn’t working. I can hear the otherside very well, but the otherside can’t hear me anymore. Before i put it on speaker (normal conversation) the otherside can hear me, but when on speaker it isnt working anymore.
Is there a fix for it? Software-update or anything else?