I have an Onkyo HT-S770 system with the Onkyo DV-CP702 DVD changer. The system is great and really sounds amazing. However I have been having an issue on and off since I got the system. About every few days or so, when I turn the receiver on there is a high pitched feedback noise coming from all of the speakers. It happens regardless of chosen input (DVD, TV, Stereo, etc.) and will only stop if I turn the unit off and on again or change the selected input. My local repair place has had it in and can't replicate the issue so Onkyo asked me to send it to their repair center in New Jersey for them to look at it. Trouble there is that means I have no receiver for a few weeks, and no gaurantee it is fixed either. Has anyone on this board had this same issue? If so, were you able to get it fixed? Any and all info is much appreciated.