Face ID is Not Available - Any Help is Appreciated

Hello everyone.

I am an android user myself, currently using a Google Pixel 7. Not perfect, has several issues but still does the job for the price.

My a week ago my gf wanted to buy a new phone. She had problems with different android phones in the past so I advice her to buy an iPhone for its stability and overall great camera performance.

We got my girlfriend an iPhone 15 Pro. Her first iPhone, she loved the experience for a few hours.

A couple of hours after taking brand new phone out of its box, Face ID stops working, it says Face ID is not available.

I google, I read reddit and apple forums, even YouTube and watch videos. Everyone says the same things;

Clear the camera (its a brand new phone)
Hard reset the phone
Delete Face ID and add it again.

She hard reset her phone more than 10 times within 7 days she used the phone. Always works for a few hours after the reset and then stops working again.

Apple is useless as fuck when it comes to this issue, I have seen a hundred different posts on the forums, telling people to do the same thing over and over.

At this point I believe this is a hardware issue not a software, but I could be wrong since it works for a few hours and then stops working each time.

So here I am for your opinions/experience. If any of you have had the same issue and fixed it in a different that we have not tried, could you please let us know?