:sunspots: n. 1. Notional cause of an odd error. "Why did the
program suddenly turn the screen blue?" "Sunspots, I guess."
2. Also the cause of {bit rot} --- from the myth that sunspots
will increase {cosmic rays}, which can flip single bits in memory.
See also {phase of the moon}.
-- The AI Hackers Dictionary
cosmic rays n.
Notionally, the cause of bit rot.
However, this is a semi-independent usage that may be invoked as a
humorous way to handwave away any minor randomness that
doesn't seem worth the bother of investigating....