P60, FW 1.1.14 here.
Got the TV around the end of December, and had no issues until this morning. I hooked up a new AVR & wasn't able to get any signal using HDMI5 so I switched to HDMI4, where it worked fine for a few hours, but now I'm seeing a thin black line near the top of the screen that goes about halfway across the screen from left to right (pics attached). I've tried toggling GLL & turning the TV off/on, and the line also appears using the built in Netflix app, so I don't think its the AVR. I don't remember seeing anything like this in the thread so far; does anyone have any suggestions here?