Q: Spontaneous crashes iPhone 5

Have you seen the screen change colors at any point? Have you attempted a clean install of the OS?

Use iTunes on your Mac or PC to restore your iPhone, iPad, or iPod to factory settings - Apple Support

Some restore errors to look out for and their meanings.

Get help with iOS update and restore errors - Apple Support

Try a Forced Restart. Hold down the Home and Wake/Sleep buttons at the same time for about 15-20 seconds until the Apple logo appears. You will not lose anything.

If a forced restart does not help try a System Restore. First backup your device using iTunes. Also import your photos to your computer and copy all important data. Try restoring from backup first and testing it. If it does not help, you may have to restore as New and reconfigure from scratch as the backup could be corrupted. For this reason it is important to have your photos and data saved separately from the backup. Here are the steps for a Restore:

https://support.apple.com/en-us/HT201252

If neither helps you may have a hardware issue and should take it to an Apple Store for evaluation.

My pleasure, glad it worked....