I had my first IR scare yesterday.
I've owned my f8500 for a few months and I've watched all types of content without issue: long letter-boxed movies, older 4:3 TV shows. all kinds of sports, etc. About a month ago I watched the entire season of Survivor:Fiji on Amazon Prime in a few days. It's broadcast in 4:3, but I saw no IR after any episode and never gave it a second thought.
A few days ago I started Survivor:Panama and was about 10 episodes in when I binged about 4 or 5 episodes in a row two nights ago. I was drifting a bit and probably not paying as close of attention as I should have been, and when I decided to exit Prime after the end of an episode my heart skipped a beat. Sure enough - there was a clear gray outline of the left side border visible after exiting the show. This was unlike any IR I had ever witnessed and I panicked a bit; it was easily visible no matter what was on the screen. I immediately decided to scroll for a while just to be safe. Next I decided to play some sharp colorful content so I streamed some episodes of Lost through Netflix.
I decided to check again after a few episodes had finished and the screen looked ok, but careful examination revealed the outline was still there, especially during bright scenes (ocean, beach). The right edge line of the border box was still particularly clear. I decided to let it scroll overnight. The next morning (to my relief) it seemed undetectable, but on a gray menu screen the outline of the border is still slightly visible. It's almost gone. I'm going to let the set scroll for another night.
How did this happen? I thought sets get less IR prone with age, not more. Can I no longer risk watching 4:3 content? Why was the IR only on the left side of the screen?