Face ID keeps turning off

Hello Wakehurst,

We’ll need some additional information to provide more specific support.

Are you seeing an error about Face ID has been disabled? If so, you can follow these steps to resolve this: If an alert says Face ID has been disabled on your iPhone or iPad Pro - Apple Support

When you say Face ID turns off, does this happen in a specific app?

Is there any improvement if you power off and restart your iPhone? Sometimes this can help resolve issues with Face ID. Here's how to complete this step: Restart your iPhone - Apple Support

Thanks.