Would like to get an inkling of what could possibly be wrong in my phone based on behavior described

Sanjit Keskar

Aug 8, 2013
Of late, when my fully charged phone drops to around 80% a call or video viewing will cause it to trip and reboot without notice. When I turn the phone back on the charge has dropped straightway to 55%. This will happen again at circa 40% and te charge dead drops to 28% or so
What may be causing these sudden dead drops?
I have tried calibrating the battery twice (no success) and have scanned for possible rootkits and virus too (none are there)
From 10% to 0% charge this does not occur al all
It also does not happen when the phone is pluggin in and used at any charging level
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