Why does my pace HD box shut itself down every 30 minutes and the reboot itself ?? unit also freezes about one minute before shutting down by being unable to change channels ... It will reboot itself in approx 1 to 2 minutes and work fine but at the 30 minute mark just goes off and the cycle starts all over again .. Started last last night ( Friday ) about 1130 PM and continued all day Saturday .. Shaw advised of problem but say earliest Tech Help is not until the 23 of May .. frustrating ..