I purchased my CS-700 home theater in May 2009 from Best Buy and I also have the same problem. In fact, this is a new unit that I received in November, 2009, since the original system was replaced by Klipsch due to a problem with the power supply or failure of the head unit to turn on.
I also have a problem with the subwoofer generating a thumping sound periodically.
So were you able to resolve this problem? I am a true Klipsch fan and I hope this does not burst my enthusiasm of this great company. In fact, I still have fully functional Klipsch kg-4 (1984 vintage) and they still sound great.
