Burnt copy works on PS3 & not on S550

I have made backups of a couple of my movies and they work fine on my PS3 but not on my S550. The S550 freezes/pixelates/stammers on the backups but not on the PS3. Both are Sony and I dont get it. Has anyone else had this or a similar problem? I feel like the Lone Ranger!! Thanks for your help in advance.