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The Priv was released in late 2015 with a problematic Qualcomm 808 CPU that was prone to heating up easily and drained the battery relatively quickly. It shipped with Android 5, but a later upgrade to Android 6 did help with some of those issues.
Is this a new phone for you? What Android version is on it now? You might need to run an autoloader with the updated OS. It may help, somewhat.