Last night my VIP722 deleted all my recordings before 9:00 CST. Everything that recorded after that is there. Any idea what happened and more importantly, will it happen again? If I cant trust my DVR I have to make a change. I'm on my 3rd 722 since 2007. Usually they pixilate before the hard drive fails and its gradual. I have never lost recordings before. Thanks in advance for any insight.