Electronics in transit to, and on the surface of Mars are constantly bombarded by radiation. Hardened electronics are designed to resist the effects of this radiation.
Physical shielding, such as heavy metals or a Faraday Cage can block many types of radiation before it affects the electronics
Electronics can be designed to resist radiation, to a certain degree.
Redundancy, sanity checks, and dead man switches can ensure reliability and notify operators of errors.
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