Depends on what you mean by randomly. Computers and electrical components are mechanical devices that experience wear. As use of a device increases so does the likelihood of error due to micro damages causes to the system.
Additionally they can be effected by outside events. Notable powerful events are lightning storms and solar storms.
Electronics, as with most things in life, are prone to errors and a great deal of effort goes into its creation to minimize these errors / maximize the consistentcy of the device
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