Why does my ZTE Sonata Z740G act on its own?

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Why does my ZTE Sonata Z740G act on its own.

My phone is about useless at this point. It randomly makes calls from my phone log, contact list. It turns itself off and on. It gets locked into bouncing around from screen to screen, apps turn on by themselves, such as a flashlight app. It does not respond to touch, when it's doing that, and the only way to stop is to remove the battery.
 

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