What causes The White Screen of Death on iPhones?

I just had an issue with my iPhone where the screen turned white then, i looked it up and fixed it. I was just wondering what caused it that way i can prevent it next time.

Nothing can harm any PHONE if ~ u ~ no what your doing Master Reset!

Apple products sometimes spaz out. If it is a device malfunction apple will switch it. Otherwise just depend on iTunes to restore. If you're jailbreaking, watch tweaks to speed up your iPhone. Those are bad

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