How do random glitches happen on computers and smart phones when the code is perfectly fine?

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How do random glitches happen on computers and smart phones when the code is perfectly fine?

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They happen because the code is never perfectly fine. There are errors in any software. The code just mostly works, while in a stable situation. Once in a while something unexpected happens – like a network loss, or a hardware problem, or some weird user input – and the software might not be ready for this kind of scenario. This is when you see a glitch.