Okay, I need your help. Here's what happened. Watched TV for about 5 hours on Sunday. Onkyo TX-SR600 was set at Video 1, display showing Dolby Prologic II all this time. Volume was set between 55 and 65 through out the night. At 11pm, we decided to go to bed and tried to turn the Receiver off via remote.............no change. I tried the volume...no change. Thinking my remote has gone bad or low battery, I went directly to the receiver's switches. Pressed the power button...nothing. Pressed every got d**n switches on the front panel....nothing. Again, "Dolby Prologic II" was displayed on the screen so the power is there. I had to unplug and replug the receiver. Now everything is working again (for now). As an additional note, I do think there's enough ventiliation. I do have DVD,VCR, and CD stacked along with the TX-SR600 but I also do have about 4" spaces along the sides, and bit more in the back (although the rear is enclosed). I did not have this problem when I was using Onkyo 414 Pro on the same spot for 5 years. How could this happend? Is the TX-SR600 defective? Any advice is greatly appreciated.