While editing my project in Vegas Pro 18 I encountered a crash and had to restart my PC. Afterwards audio files were missing from some of the videos in my project, particularly it was only footage from 2 camcorders that suffered this, all other footage from GoPros etc were completely fine and had audio files present. When I play the affected footage outside of Vegas then audio is present.
I have tried starting new projects and re-importing the files along with even re-installing Vegas but I cannot find a solution.

Thanks.