Are you using the smart radio feature of GB? When I tried using it to save battery I noticed a lot of different issues with missing calls, texts, making calls, etc. I ended up just disabling the feature altogether and not bothering with it. As far as your recording issue I couldn't guess.. Definitely a software issue. Try disabling GB, rebooting, and seeing if the problems persist. Then you'll know for sure if it's GB.
Thank you for your reply,
I tried everything, turn gravity box off, xPosed, a reset, and finally, pushed again the stock firmware via RSD Lite, but still not working.
The volume of the mic is pretty low, only way to get it receive any reasonable sound is blowing the mic entrance.
Recently I replaced the screen, maybe something is not right inside, but still, it looks like a lot of an software problem
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