My Unimax U452tl keeps turning on and off, why?

My phone screen keeps turning on and off. And also have up and down arrows (upload and download?) next to wi-fi signal strength that is always blinking and I can't find out what the icon means. nothing in ant manuals that I can find.

I think that just means that you're connected to a wi-fi network and that data is being sent or received.

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