No Program Info beyond next 2 programs on 721

my 721 program guide only provides info for the current and next program ......There is "no information available" throughout the guide.......Shouldn't I have up to 7 days, or at least 3 days worth of info?.......Both tuners are connected to a SW64 switch, and is otherwise working properly....Thanks for any insight or info on how to fix the problem......NYSatman