Normal
I think I've found something. You're right the dynamic refresh rate wasn't an issue. Noting that the GPU was likely the problem, I entered into MP Config and then the LAV video decoder options and changed Hardware Acceleration from NVIDIA CUVID to DXVA2 Native. I've been testing with multiple movies and so far the issue hasn't reappeared. I don't want to count my chickens yet but I'm hoping that fixed it.