Hey on my daughter's 2008 Acura MDX AWD the check charging system light comes on occasionally when slowing down or taking the foot off of the gas pedal. Mechanic checked it...replaced Battery for a "Dead cell", new alternator, and new belt. Still doing the same thing. Mechanic says charging is fine and that this is a common problem. Hmmm, never had this problem before now. Not sure where to go from here....any suggestions or help on this one?