Rich recently bought a 4K TV, now he's having issues watching Blu-ray DVDs that are non 4K, because it's a bit "jerky." Leo says it's called "decoding hesitation." Scott says that the very first Samsung Blu-ray players had problems with resolution and detail. It's also related to upscaling. What's odd is that it's inconsistent, happening every 5-10 seconds. Leo also says the Blu-ray player is losing sync when decoding the data stream. A better player will fix the problem, and if Rich is looking to get the next component in his new 4K system, the Blu-ray player is where to start. The good news is that Blu-Ray players are really cheap now. Scott also recommends going with a 4K HDR player as well. Sony, Samsung, and any name brand is good. Here are the best UHD Blu-Ray players according to the Wirecutter.
The chatroom says it may be a good idea to check for a firmware update on the Blu-ray player first.