Why is my non data phone (texting & calls only) powering itself back on?

My phone does not hav data that I know of gift from boyfriend seems battery gets hot & when turned off phone immediately powers itself back on. home screen seems to come on or brighten without being touched. why does it echo screeching through various speakers eg. My comp., or stereo? Also rings but when I answer caller I,d, shows 000. This has happened with past 3 phones.

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