Hi All, I am new to the forum here so bear with me if I forgot to include anything in this question. I purchased a Sony STR-DE445 about a year or so ago and have had little trouble with it until recently. What happens is the surround sound will be working perfectly (5:1) and then after a while, it could be 5 minutes or it could be several days/weeks, there will be a very audible "Pop" sound and all 5 speakers will fall silent. I would equate the sound to what you might hear if you slap your forehead because you forgot something stupid Anyways, sometimes if I power it off for a day or so it will work again - but only for a while. On 2-channel it works fine all the time. When the surround sound is working correctly, the speaker test goes around to all 5 speakers corectly. I have done some basic troubleshooting myself like switching the speaker wires on the receiver to be sure the speakers themselves are ok and they all check out. I am looking at purchasing a new reciever unless I can find out what is going on with this one. Anyone have any ideas at all?? Like I said, I am a newbie here so if I have missed something obvious, let me know! Thanks!