Here is a video of the odd behavior.
I've tried both. Since this thing had only a one year warranty and it's otherwise working fine, I guess I'll just live with it. Doesn't give me much confidence in long-term durability though.
We have exactly the same problem. I have done all these steps and it still flickers. My confidence in Samsung Appliance is also dropping. THis appears to be a manufacturing QC problem. Most likely the boards were not burned in properly, hence the failure at the same time.
We're always happy to help in any way we can. Thanks again for being part of our Community!