Well, keeping time and last station are sort of the same thing if the answer is "no it forgets them" to both then I'd say your losing connection to your battery at some point... probably a short or possibly bad wiring of a car starter or alarm that you had put in. Maybe a corroded battery cable... something electricle... you'd think if thats the case you'd have the odd time where you go to start it and get nothing... just a click, and then try it again and it works... but depends on where the short is.
If the answer is yes to either, as in it does keep the time or last radio station but it forgets programed stations I'd say its a short or defect within the stereo its self. Not as significant of an problem unless its slowly bleeding power from your battery... then it could cost you down the road... by needing a boost one day and your (dead) battery possibly freezing and needing replacement.
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