Hi, does anybody else have a problem with the action, my video freezes for a split second and the sound breaks up intermittently. Very annoying as it spoils the recording completely.

Nope. Never had these problems. Is your Micro SD Card fast enought?
U3 card?

Hi. I am sorry for the trouble your Osmo Action has caused. During recording of the video are you seeing any error message. To isolate the issue, kindly please try to use a different SD card or Format the SD, prior to doing this step please back up your files in the SD card so that you have a back up. In addition, if issue still persists please provide a sample video for further assistance. Thank you.