Lock-ups with Universal BDs

[[epitomosity]]

Yesterday I attempted to watch 'Forgetting Sarah Marshall' for the second time and tonight I attempted to watch 'Wanted' for the second time. Upon watching both BDs, they locked up about halfway through. When I restart my system or try to play the disc again, I get a message saying the the video is unplayable. I have a PS3 with up-to-date firmware. I've also been able to successfully watch my other BDs multiple times with no problems what-so-ever so I'm fairly positive that it isn't my system. From other posts on the forum I've noticed that others have had the same problem with these titles as well as 'The Incredible Hulk' and 'Hellboy 2', all of which are from Universal. Does anyone know why this may be happening or if there is a problem with Universal's BDs or even the PS3 for that matter? I'm getting really frustrated here and do not want to shell out more cash for new discs or even a new player for that matter.