Wifi never goes off if phone goes to sleep? In previous version I don't see this. (Of course I have option Never keep wlan on during sleep) But it strangely don't shorten battery life (which is awesome on redmi 3). On my wife's Kenzo battery life is strangely short. All functions disabled to lengthen time, it drops from 100℅ to 90℅ in 4 hours in sleep. Android takes 76℅, android system 13℅, all other less than 10℅.