Samsung SGH-E900 / E906

question...

i've just inserted a 1gig memory card in my e900 phone... the problem is that the videos i place in my memory card is not playing well... the audio of the video is faster.. also if i press 1 which is to play the video in full screen, it stops after a few seconds... but when i transfer it back in the phone memory... it seems okay... does my phone have a problem or is it the memory card? is it really like that when you place your videos in the memory card? please answer...