I see series that I want to record that start 2 weeks from "today", but my program guides only go out to 7-8 days. It used to be 2 weeks, which was bad enough, but now it's down to a little more than 1 week. Also, so many listings are just plain wrong, so that even if you do want to record a program within a week, you can't because it has a different program listed for that date/time.
If you go out one day at a time past the current guide does it load?
Mine usually does.
If not, have you rebooted router and STB?
And can you give examples of where the guide is wrong?
I can't say the last time I saw something wrong except for something that was a last minute change.