my iphone goes off by it zelf

Hi ignatius112,

This article will walk you through checking your hardware and software to find out what could be causing your iPhone to shut down unexpectedly: If your iOS or iPadOS device restarts or displays the Apple logo or a spinning gear unexpectedly

If the issue continues, you may want to consider getting it inspected at an Apple Store or Apple Authorized Service Provider. You can find stores here:  Choose Your Country or Region

Or, if you'd prefer, reach out to Apple Support directly so they can look into this with you further. They can be contacted here: Get Support or by calling the most applicable phone number from this list: Contact Apple for support and service.

Regards.