It is. Even more because this problem is still present since we buy the FP3+ new just on October 2020.
Just for your information, as we all have the same problems: I posted my current experience about this issue in the main thread of the last software update.
Maybe it brings more attention to the Fairphone people as they started this thread.
It still makes a difference? I realized in OSv77, that the issues (distorted voice, mic fading, etc.) happens while using the phone or the bluetooth earphones. Same troubles for me.