Hello, I’m Nathan, and I’ll be assisting you today. My livelihood depends on your positive feedback, so your satisfaction is my highest priority.
Sorry to hear you’re having trouble, Ken.
I can't give you documented statistics, but I can give you anecdotal evidence as an authorized denon dealer/installer and from a repair perspective.
Overall, this model has been very reliable, I've only seen a handful of failures, and those were related to the ethernet adapter. It is one of the CI series, so it is highly capable, and well built (one of the few receivers with most parts made in Japan, not China), but it is now past the warranty period, and parts wouldn't be readily available if something should happen.
$700 is also pretty high, I wouldn't consider it to be worth more than about $500-600 tops at this point. If you're willing to spend $700, you may as well up it a bit and invest in a brand new model with a fresh warranty that will continue to have regular updates. The comparable current model you can get refurb for about 1100: http://amzn.to/1NOaZpY
You could get a used model cheaper, if that is what you wanted: http://amzn.to/1P0zy3V
Do you actually need 9 internal channels? If not, you could get by with a 3311 or one of the current http://amzn.to/1P0zGjU