The problem arises due to very low 4G/3G network. App setting constantly searching for networks / switching networks due to low networks. Better try to put 2G or 3G only network in night time to ovoid the overloading the system CPU and excessive drai...
This is due to poor quality of samsung phones.. same problem has happened in my phone too...also from internet...i came to know that this is something frequent problem for samsung phone price less than 20k.
