Bad sound during phone call: phone is up side down?

[zevv]

The gemini is supposed to work both-sides-up for phonecalls, but every few calls I make I get complaints from the other party that I can barely be heard - then I flip the phone up side down, and everything is ok. It seems that the Gemini sometimes has problems detecting which side is up, or properly switching mic/speaker. Does this happen to others as well?

[PJS]

I've been told something similar from a number of callers...   If the
wanna-be-more-than-assist-button is close to the mouth, then callers complain
about the sound.   If that button is closer to the ear, callers tell me
things sound much better.

c'est la vie.

PJS

[shinkamui]

I've done some pretty thorough testing at this point with the dual boot flashed image, and no matter how i hold the phone during the call, rotating it the other side remains pretty much the same.  The bigger issue I've seen has been with the LTE to HSPA/UMTS downgrade, the phone appears to be too aggressive in switching, and results in a dropped call.