I was just curious about if my class 2 micro sd card is to slow to handle the data of a hd video recording because most of the time the audio and video in unsynced and I would think that is because the card cant keep up with the write speeds and the sd card is pretty full of stuff also its 16 gigs with 3. something left but Id like to know all your opionions if maybe a class 4 or higher could fix tht?