hdr-as30 problem with recording

[stelios_ath]

i bought the camera few weeks ago and i have a problem with the recordings.

i use a class 10 transcend micro sd card 32 gb. i recorded some action and the problem is when i transfer these files to my computer,the film isn't playing smooth.in all the films there are continuous freezes like little pauses and the sound isn't syncronized.i tried different players and of course play memories but always the same problem,so i think something happens with the recording.

any help?