Did you over get to the bottom of this problem with the mics? My MC7000 does exactly the same thing. If I talk into it loudly it sounds like it should. If someone is speaking into the mic from a few inches away (giving a toast), it sounds like it is “breaking up” or “dropping out”, but it’s not. I believe that the attenuation is kicking in unless you really project into the mic. It’s really bad with lapel microphones (unusable). I feel like it all started after the firmware update, but I could be mistaken. Regardless, I have this problem and need to get it fixed asap.