my iphone keeps shutting down

Your battery may be at the end of its life.

Batteries degrade over time with usage due to chemical aging, that's just how they work.

You can expect about a 1% drop per month with average use on an iPhone. This is an approximation, that is why it may be plus or minus a few percent on a month to month basis.

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

iPhone Battery Replacement.

iPhone Battery Replacement - Apple Support

About Lithium Ion Batteries

iPhone battery and performance - Apple Support (IN)

When was the last time that you replaced the battery?

Can you check the Maximum Capacity of the battery?

Settings > Battery > Battery Health & Charging > Maximum Capacity. If it is less than 80%, the battery needs to be replaced.

deborahchemutai Said:

"my iphone keeps shutting down: my iphone starts normally and display everything okay then after about 5 minutes of being on, it automatically shuts down and restarts itself again"

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Getting Back into your iPhone:

Your iPhone is reportedly stuck in a boot loop. This can occur when installing an update, and it stalled while in the process.  So, user MY User Tip: How to Fix an iPhone in a Boot Loop - User Ti