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Hi there and welcome to Just Answer, my name is ***** ***** I look forward to helping you.
I’m sorry to hear you're having trouble. I know that can be frustrating. Hopefully, we can get this resolved quickly.
If it is powering off instantly, then it points to an issue with the battery or mainboard, basically a hardware issue.
But first to rule out the firmware as the problem, I want you to reset the phone.
This will remove all data from it and return it to new, so first please backup your data using the instructions here.
Once done, then on the phone go to settings, search at the top for Factory Reset and do this.
Once done, setup the phone again and tell me how it now functions please.