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I'm fairly new to all this myself, how about booting into safe mode one evening, and see what happens the next morning, that may eliminate any downloaded apps.
Just a thought until an expert comes along. 
Ray
I am also facing this problem 
Is the phone connected to wall socket over night?
Nope
Try settings-apps-all-smart connect,force stop and clear data.See if the same occurs.
Try settings-apps-all-smart connect,force stop and clear data.See if the same occurs.
this method not working.
Yes it was connected to the wall socket?????? how is it related????