iHeartRadio Shuts my phone off.

At first i thought it was just something wrong with the app. I reinstalled it and same thing. Basically I turn on my iHeartRadio app, start listening and about 20 min in it just shuts off and reboots. Its not random it does it everytime. It sucks because i need to hear my podcasts. So far i have lots of memory and a huge micrsd card. Also the app is on my internal memory. Is it a setting or bad phone.

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