The players I see in Smart TVs are limited things. Nothing close to a PC we had over a decade ago.
The reset failure to me makes this a warranty issue. If the maker can't fix that, head to the returns counter.
This is an 8 month old OLED 55E6V, best I have ever had - until this problem flares up.
Essentially, whatever I am doing, every 2 minutes or so the screen goes green and a small message in the corner says "This App will now restart to free up memory". That interrupts whatever you're watching or listening to.
I had been trying to watch a movie from a USB drive. Gave up on that. It happens so quickly, you can't even get in to settings to reset the whole thing to the original factory settings.
I am going to switch it off and unplug it tonight, detaching USB and Apple TV, but would be pleased to hear if anyone has had a similar experience, and if they have a solution. Getting an answer from Korea is a bit of an uphill task.