my iphone keeps shutting down it shows a spindle wheel circling around and then just shut down or crashes. Please help it

Re: "my iphone keeps shutting down: I just updated it last night : Please help me figure this out"

Apple support has an article online that may be helpful:

If your iOS device restarts or displays the Apple logo or a spinning gear unexpectedly

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Wondering if your iPhone has enough free memory / storage space in which to operate!

Eg: An iPhone needs at least 8Gb free in which to do what you ask it to do.

See: How to check the storage on your iPhone and iPad - Apple Support

If you are short on storage space: It is a wise idea to back-up your data before making space available. : Eg: How to back up your iPhone, iPad, and iPod touch - Apple Support

Then see: "Manage space on your iPhone" in the article below for tips:

If you need more space for an update on your iPhone, iPad, or iPod touch - Apple Support

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Else if storage space is not-a-problem:

There may be third-party (non-Apple) apps that cause issues:

Eg: virus-checkers, ad-blockers, cleaners and the like, even VPN, often cause problems.

There are generally all un-neccessary, so may need to be removed.

Any necessary third-party apps may need updating to remain compatible with your iPhone.

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More info: If your device freezes or has performance issues, try these tips.

If your iPhone or iPad is running slow - Apple Support

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More support if needed: (online chat / phone / email etc.) from the "Get Support" link near the bottom of the webpage: iPhone - Official Apple Support