I am having the same issue. My problem is in the beginning stages. I bought my 8500 in July 2017. After warming up, the vertical hold will start to flicker, then after a while longer, it scrolls more rapidly. Soon after I get the vertical blue green vertical lines across the whole screen. This definitely sounds like a defect on these models from all the complaints lists on this forum. Very disappointing for the amount paid for this "high end" model. I have not heard back from customer service yet. I assume the news won't be much better than that already found on here already.
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