Kodak Playsport (Zx3) playback problems!!!?

it will most likely be your computer , these video's are huge in size , and compression is sometimes a problem , I would be putting my money on the player , not the camera , also trasnfer the file onto your harddrive when playing , the usb 2.0 transfer in/out could be having a task trying to play your files directly from the device , drag them to you computer and try playing them , they may just be struggling over the usb 2.0 lag