Thanks so much. I have really limited troubleshooting experience with TVs and Samsung online support couldn't tell me much, so I was really looking for a validation of what I was thinking that it was probably power related. I'll go ahead and schedule a warranty visit. That video is all I have at the moment, as it was the first time it did it in a few hundred hours of use and, like I mentioned, it stopped after unplugging and plugging back in. Thanks a lot!