I am not having any GPS issues nor proximity in calls bug.
Thanks for the update.
I really don't know what to say... Based on the feedback from some users, the last know working kernel which doesn't cause the no-audio issue is the one from 0326 build. However, we have reverted all kernel changes merged between 0402 to 0326 and ...
Assuming you are running TWRP, go to INSTALL and the bottom right there is button that says IMAGE, tap that and select your boot.IMG.
That's how I did it :)