For what it is worth, I've been lurking and reading the Panasonic Plasma posts for over a year, including this one regarding IR. Despite the concerns I had from reading the posts, a few months ago I purchased a 65" GT50.
After a few months of ownership, the TV is perfect. No IR, no audible buzzing on fully lit white screens, no problems whatsoever. I am a very satisfied customer
Not to discredit other posters who are experiencing trouble. All products have a % of infant mortality, quality problems, etc. But from my personal experience and that of friends who have purchased a 2012 Panasonic, these are marvelous sets. Maybe will go down as an excellent vintage.
Now if only I was so brave after reading all the posts about how bad Onkyo's 2012 quality is.......