What the heck happened to my DVR?

I know that the tv stations have all decided that shows no longer need to start and end at exactly the top of the hour, but it's really starting to make me mad. Almost everything I've recorded lately is cut off at the end! What is up with that? Why do networks feel it is okay to go a few minutes over? Don't they know people are missing the ends of their shows? My DVR is my favorite invention of the last ten years. What will I do if I get so angry at it that I can't DVR anything anymore?