Curious that you have an issue with a 1080p blu-ray, though. Is 24p output on the Sony set to Auto? If not, set it to Auto. 4K Upscale Setting should be Off. YCbCr/RGB set to Auto? If so, try YCbCr 4:2:2. If 24p is not set at Auto, a conversion to 60p can cause issues with output to some AVRs and TVs.