Sorry that you have had problems, and seemingly not very good advice / help from Pan.
Some thoughts:
1) Paragraphs would make your story a lot easier to read!
2) Although somewhat beside the point, others have advised that the "2000 hours" remark lies somewhere between Extreme Carelessness and Sheer Stupidity on the part of the rep.
3) I did a fair job of "babying" our ST50 until some point just beyond the 200 hour mark - we were watching normal programming, including widescreen movies, well before that time, but I was Careful to avoid Static Images that seemed likely to cause IR. As have noted before, our Particular Panel went through a period of Heightened IR, from around 250 to 400 hours - since that time (and, in all likelihood, Throughout that time...) the set has become LESS prone to Quick Onset IR, and such IR as does creep in now belongs more in the Short-Duration category.
In these regards - onset of IR, and duration of IR - this panel is drawing closer and closer to our two older Panasonics, and I no longer consider it (IR) a Significant Problem.
4) At the same time, having changed at least once (around 400 hours, and for the better), there is certainly the possibility that it will change again, and perhaps for the worse, as appears to have happened to some owners of 2011 panels.
5) Disclaimer for #3: Although I do not consider IR a Significant Problem on the ST50, I still consider it a Potential Issue - just as I do for our older panels, and would for ANY plasma panel. It is obvious that different people have varied levels of sensitivity to IR, and that - for whatever reason - some panels seem to be more (or less) prone to IR than others, even within the same model year. I suspect that a lot of this could be accounted for by a Careful recording of Settings & Actual Content (& time displayed, of course) - but even then there seems to be a LOT of variance in owner reports....
6) The "Smart Viera Logo" that pops up at start-up has NEVER left IR beyond a few seconds after its disappearance - even during the worst IR stage of this panel. That it leaves a persistent IR on your panel at least implies that there is SOMETHING unusual going on, and I think that you are correct in reporting it.
7) Who did you speak to at Panasonic? And did she Actually call you a Liar? Frankly, would have immediately requested transfer to a Supervisor: CS Reps often get a lot of gruff during the day, and can certainly get a bit brusk at times. I usually find that a bit of Patience & Politeness goes a long ways, but there ARE limits that should not be crossed.
8) This is probably also besides the point, but we've have a couple of conversations with Pan CS Reps, and a Tech Rep, and were very pleased with the response we received. Our No. 1 Son also called Pan about his 2011 panel (Green & Pink tints - same problem we had in 2011), and had no difficulty getting a local tech dispatched to examine the panel.
Sometimes the way "WE" approach a "complaint" call can have a significant impact on how "They" respond. Perhaps that should not be the case, but if someone has been yelled at (or worse...) All Day Long.... well, as noted above, it can make them somewhat Brusk: "they" are also "only human."
9) Where did you buy the ST50? (Apologies if you've mentioned that earlier.) IF you otherwise liked the set (beyond the IR....), and are not completely beyond the point of forgiveness, you might see whether you can exchange it as Defective, AND receive not just a new panel, but ALSO a reset Return Period. (Amazon granted us both of these when our first 60ST30 proved to have an Increasing Pink Tint.... They delivered the new panel, and picked up the original, at the same time - most convenient!)
10) OTOH, given your experience to date - and doubtless an increased sensitivity to IR - you might want to look at the Samsung E6500 plasma: it is reputed to have nearly identical overall PQ as the ST50, AND to be considerably less susceptible to IR.
In any event, Better Luck with your next panel, whatever brand you choose to try!

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