Is your gps on and Google location accuracy could be draining battery.my Bluetooth when connecting to my car i have to toggle the media to connect and no preview in camera when save to sd card is on, when its off preview works and Bluetooth will connect eventually and call recording not working,i don't really use it anyway, that's it,but battery is good and everything else is fine,rom runs good and smooth
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Call rec works if you disable voice math on Google app.