Random errors are possible from radio interference or something like that, but are extraordinarily rare. Programs and operating systems are extremely complex, so errors can appear random because you do not understand the triggering mechanism.
Most technology errors that are really random are human errors. One of the primary benefits of automating a process and taking humans out of it is that the errors are no longer random. Consistently patterned errors are easier to find, explain, compensate for, fix and cleanup afterwards than random errors.
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