Last night my DSR505HD started to malfunction. First the sound went out. I held the on/off button down for 30 seconds to reboot and when it came back on the channel banner would not go away. I could not change channels but the sound was back on. Then I unplugged the receiver for a couple of minutes and plugged it back in and everything worked. 20 minutes later the problems started again. Whats up. Not a enjoyable way to watch CSI season premier. Any suggestions.