Hi,
I’m not sure is it the same error I’ve been. And I don’t know why this is happen.
But for the solution, try this.
Take the CTI to the position where your no sound clip is.
Choose it’s layer then press “T” on keyboard as it’ll do the match frame on your monitor windows.
Now your clip should have sound. It’s work for me.
But if you have so many clips like hundred of clips, I suggest you to save as your editing project.
Delete every unused clips off the timeline and don’t forget to select Menu “Project > Remove Unused”
Then Import this new save as project instead.
Hope this is useful.
Regard,
Ketklao K.