Android not responding, screen off and battery drop

I have a Lenovo s890 that sometimes stop responding and back after about 1 minute. I have checked the screen and seem there is no problem with the screen. On the other hand when the cell phone stops working, then the battery indicator drops significantly that is really annoying. Do you have any solution for that? Here you can a similar video that shows the problem. https://www.youtube.com/watch?v=FB_w4WvDiUY