G2 d800 turns off itself below 80% battery on gsm

Lg g2 is keep turning off below 80% to 75% .. It Is not actually shutdown with animation ... It just went off .. Whereas when i turn the phone on Airplane mode it works flawless (works whole day even on gaming wifi music no issue with Airplane mode on ).. I dont know what is the problem ... Because battery backup on Airplane mode is great ... Currently im on cloudy3.3.

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