Why does my ZTE Quartz always shut down during phone calls?

It always turns itself off when i am phoning someone....battery is always charged, have full service and minutes on it and am always in a full coverage zone. I'm fixin to chuck it through the window and buy a different one if it doesn't get fixed

Hi Lastaats. Are you using a 3rd party phone app? If you aren't, try using one. I'm thinking the preinstalled app maybe causing this.

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