Okay, although it is very rare for me, I've noticed that occasionally some 4K Blu-rays that I've both owned and rented freeze up in whatever chapter of whatever movie I'm watching. Like I stated, it's rare, but I've never had it happen with Blu-ray, Blu-ray 3D, or DVD. My player is also region-free on Blu-ray and DVD if that makes a difference. The model is Sony UBP-X800. I've heard that 4K UHD Blu-rays are more data heavy and even though rare can get scratched and freeze up easier? Is that right? Thoughts? I'm curious...