Originally Posted by jaybeech
Like several other people on this thread, after 6 months of use my SR8400 acquired an annoying habit of shutting itself off and on, off and on, until functionality is completely lost in a barrage of clicking sounds, at which point your only choice is to pull the plug. It usually takes a couple hours for the problem to arise.
I shipped it off to an authorized service center a couple months ago but--my worst fears realized--they've been unable to replicate the problem.
They suggested that one of my other components might be faulty. I know the problem occurs with TiVo, DVD, and CD, so that can't be right. But come to think of it, all those components are connected to my 8400 via optical cable.
So there's my theory: The problem is triggered by some malfunction in the 8400's optical audio inputs. Service centers fail to detect it because they probably just switch on the tuner and let it run, or else use RCA plugs.
It does sound related to heat, or possibly the short-circuit protection circuit kicking in.
Are your speakers 4 ohm? In good working order? How are they connected to the terminals - is there any way a wire strand or two could be bridging the terminals?
To determine if it is heat or speaker protection circuit related, run it for a few hours listening to the tuner at your usual volume in some multichannel mode. If it trips then, you know it's not an optical input.
My 8400 is not especially sensitive to heat. It gets warm but not hot and it's never tripped. (Oddly, my 7400 had one heatsink that got VERY hot. But even it never tripped.)