jw_ashcraft

I have a 2012 MDX tech package. When driving sometimes the tachometer will jump up and down even though there is no corresponding throttle input. The variations occur around 1300-1600 RPM and happens with no pressure changes to the throttle. It's almost as though the transmission is thinking about shifting but doesn't. If I increase pressure or manually downshift it appears to accelerate fine though. Could this be fixed with a reflash or would this be considered a "judder" as I have seen in some TSB's?