My Samsung LN55C610N1F with firmware T-MSX6AUSC-1005.0 abruptly ends at 2h3m19s when playing MP4 movies using the USB port. I have tried reformatting the USB memory stick to Fat 32 also tried using an external memory drive connected to the USB port. However, using the same movies and memory device on my Samsung LN40C610N1F with firmware T-VAL5AUSC-1005.0 the movies play fine. Samsung support have no solution. Anyone ever heard of this problem?