video recorder problem

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I just bought a new 8gb memory card for my samsung wave but the problem is that when i try to record a video at HD resolution i face a few problems:
1. when i stop recording it takes a lot of time to save the video
2. the video gets periodic "jerks" after some time
3. after saving a long video it gives an error which disappears even before i m able to read it

Note: all these problems werent there when i used to use my stock memory card(2gb)

hey dont bother to answer i got my answer actually i think that its the problem of my kingston sd card. going to buy another one of some different company.

maybe it is the new 8 GB card class and speed
buy a newer one but make sure this time to get it higher class
and of course return the old one if you are able to