iPhone keep shutting down

tuuteeta ~ The battery has reached the end of its life. Have the battery replaced and all will be well:

iPhone Battery & Power Repair

About genuine iPhone batteries

Repair Provider Verification

(Articles found by searching Apple's Knowledge Base.)

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Its time to replace your battery..

Batteries degrade over time with usage, that's just how they work.

You can expect about a 1% drop per month with average use on an iPhone.

Apple recommends replacing it when it reaches 80%. To check your battery health, go to Settings > Battery > Battery Health.

Make an appointment at the Genius Bar to have it replaced.

Genius Bar Reservation and Apple Support Options - Apple