the point u have to look is the battery % in top right, to clear ur doubt nothing turned on . i already performed a hard reset after denim update.
this issue is coming after denim update with cyan no issue,, i just restarted in that 15min gap and 11% battery for tat.??
also i noticed every single restart takes 2-3% of battery with denim update.
i am just puzzled, i did all to stop consume battery like wat ever apps i can set to not run in background i did.
i just dont know, what more to do....