For folks having this issue, here's how I was able to resolve mine. (My day old Q90 was shutting down by itself within a minute after being powered on). After doing some research which mentioned that Samsung was replacing remotes inb order to resolve the issue, I've determined that the remote is the one that was triggering the shutdown of my Tv. (I first thought it was an issue with my OneConnnect cable getting crimped). I also noticed one time that the TV turned on by itself. What I did was that after turning the TV on using the remote, I immediately removed the bateries from it. And wah-lah! The TV stayed on. Now, I don't use that remote anymore and instead bought an old school Samsung AA59-00637A remote. Problem solved. Hope this helps.
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