Directv dvr freezing/not responding?

I have a Directv dvr and sometimes when I do something it won't respond. Ex. I hit the guide button and it comes up, and I scroll like twice and it stops, I hit the button again but nothin. Or watch something recorded and start to fast forward and it keeps going and going. The light flashes on the dvr acknowledging I hit the button but nothing happens for about 30 seconds. And this issue is getting more Frequent.