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From what you have described here this sounds like a power loss causing this fault here.This can be an issue with a battery that is shorting out internally or bad cell in the battery acting up as well as loose or corroded or even damaged battery cables at or leading from the battery to where they run and connect to.I would have the cables checked for any issues as well as the battery tested for any issues with it needing repaired.
To be safe it would be a good idea to have the alternator tested as well to make sure it isnt failing prematurely as this can happen in some cases.
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