Willoid
Have you updated 13 to the 13.1 Update? If not, please do so using an opened project's Help Menu/Update. What computer operating system is involved?
What give the properties of these 9 files from the video card (assumed memory card used in your camera). What is the brand/model/settings for the camera
that recorded these files. Please confirm if the video and audio files are separate or if video and audio components in one file.
Does the problem exist even if you start a new project?
Let us start here and then decide what next. Depending on the reply, we might ask if you could post a screenshot representing the audio 30 second stop
position in relation to the rest of the workspace.
Thank you.
ATR