My HR24/100 is constantly freezing up. Usually while watching the DVR. It will freeze, then if I rewind, or fast forward, then play, it will play for like 5 seconds and then freeze back up. It will allow you to do this for 2-3 times, then it will go to a gray screen and completely lock up. No responsiveness at all. Have to push the red restart button. It's been doing this constantly now for the past 3 days. Should I get it replaced?