Blu-Ray Problem....

[alexakajeff]

I recently purchased What Happens In Vegas on Blu-Ray. Put it in my Blu-Ray player and it worked fine, to the main menu. I pressed play, it went passed the 20th Century Fox logo fine, then it was lagging and cutting in and out. I took it back to Best Buy and they tested it on their PS3 Blu-Ray problem and it worked fine. I have a SHARP Aquious BD Player, bought it on April 23, 2008. I have an Insignia 720P and it looks amazing and works perfectly with every other BD in my collection. What should I do???? How do I fix it??? HELP!!!