Regeneration problem

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I have a 2016 Ram 2500 diesel. Up to this point I have had no problems with it until this past fall when it seemed to regenerate with no message on the instrument cluster. It had always told me it was regenerating before . I took it to the dealer and they said that there were three codes listed on it and they worked on and supposedly fixed it . Hooked up to the fifth wheel and pulled it to Florida and never had it regenerate on the way . Since arriving Jan 8 it has regenerated twice while driving locally. Did not see any kind of message either time. Any one else have this happen? I drive it on the highway for about twenty miles or so and it is fine.