Recently I bought the HK 525 and I was loving the sound and quality of it. Until about a month a so, there was problem with it shutting off with no reason. I watch movie for about 2 hours and then it just shutsoff and go into standby mode. When I press the power button, it does not turn on for about 10-20 mins. At the start I thought it was must be the heat, because it is the summer month in Australia. But after changing the position of the units, it is practically in the open with nothing surrounding it. Then it works fine for a few days, and then it strikes again. Shutting off for no reason, I checked to see if the unit is overheat but the chasis was very cool and not even warm, I also checked all connections and it was correctly connected with no shorts. So I finally took it to the service center, and they had a looked at it and said there was nothing wrong with it because it didn't shutoff when they were testing it. The problem is driving me mad, because it is very annoying that you are half way through the movie and it shuts itself off. I hope someone who had the past experience can help me, because I really like the sound and feature of this unit. The speaker I am using is : JMlab 816S JMlab LCR 700 JMLab SR 700 JMLab Electra SW900 All the speakers are 8 ohm nominal.