said by Fountainhead:Your "other" boxes are most likely less than 7000 series boxes (2500, 6200, or 6216). Try upgrading them to either a 7100, 7100p2, 7216, or a 7232. They all have more memory for the current guide image, and the seem to respond more quickly with navigation.
I dont have an issue with my current Fios multi-room DVR except it is waaaaay too slow on the other boxes.
It takes forever to respond.
With the exception of the main unit, its frustrating to the point of almost being unusable.