It has nothing to do with the signals it's the hard drive. We get a constant spinning disc when accessing content on the hard drive, just like the 'buffering' icon. It's been doing this for ages, and the hard drive is only 25% full. It makes navigation incredibly slow and creates crashes and freezes because it's not accessing the content quick enough.
As this is happening with your recordings I would like to arrange for one of our engineers to take a look at the box so I'm just going to send you a private message which you will find if you click on the purple envelope at the top right of the screen.