What are the possibilities that causes an iPhone to crash

Have you tried force-restarting your phone?

• Press and quickly release VOLUME UP
• Press and quickly release VOLUME DOWN
• Hold the SIDE button until an Apple logo appears (15-30 seconds), ignoring "slide to power off"

The operative word here is QUICKLY; and try it a couple of times, the timing is a little tricky.

There are thousands of possibilities. Here are a few:

• The iPhone was run over by a bus.
• The iPhone was dropped into a toilet.
• The iPhone was pryed open.
• The iPhone was overheated.

Rust001 wrote:

causes me to loose my vacation pictures?

Backups must occur before catastrophes. After a catastrophe it’s too late.