The Sony amp was a known issue, many had the same problem
http://www.avforums.com/forums/av-a...y-str-db940-center-channel-switching-off.html
I'd read similar on the Yamaha more recently.
Someone said the centre channel issue on these amps may be because the circuitry for that channel is typically in a literally hot spot being often between the left & right circuits, or something like that.
The amps are well ventilated, not enclosed, I dust frequently. I do tend to leave on standby and use remote to power on, but then that means I'm not touching the amp and potentially chucking a static charge in it. Though the power buttons these days are just the same as using the remote. I'd have to power off at the mains to fully switch off.
The TVs - faults on CRTs (Sony again), then went LCD (Samsung), intermittent fault developed within either the PCB or power board but out of warranty and try as I might I couldn't get the replacement parts though it would be dead easy to replace either of those boards and used to be cheap. Again not the only one to have the same problem. Replaced with another and gambled on another Samsung, delivered and it had an intermittent fault causing it to reset. Replaced with another and so far been okay but I've made sure I've got a 5 year warranty but expect it to fail before that.
Going back, I had an early Sony widescreen telly that lasted a very long time. Never had a fault but I replaced it to get a bigger more fancy one. That's when the Sony problems started.
Also had a Sony VHS machine I bought way back in early 90s and that was going strong up to 5 years ago after my parents inherited it. It probably still works fine now but they've moved on to the modern world of Sky+ and DVDs