My C. Itoh has been having an issue lately with the pedals feeling kind of sluggish, a sort of grinding feeling. At first I thought it might be in need of a good cleaning and lubing (which it is) but I've also noticed a significant amount lateral movement with each complete rotation of the crank arm. On the downstroke with my left crank arm, the chain moves so far to the left that it slides against the front derailleur, and when I pedal down with my right foot, the chain gets back to somewhere in the center of the derailleur where it isn't touching anything. I know the hub wobbles quite a bit but I think that is normal (?). Could the problem be arising from the wheel simply being out of true?