I have also determined missing files has a lot to do with track names.
Since the initial track name also associates with the audio file being recorded, if any other track has the same name any audio tracks created or deleted from these tracks can overwrite or otherwise remove or make other audio files unavailable or erased.
Also duplicate track also duplicates the name of the previous track so we have 2 tracks with the same name and thus will cause the same issue.
duplicate track should add a 1,2,3,4 to the name to solve this one.
So duplicating track BASS will become track BASS2 ETC…
The other cause is AUDIO UNITS or INTER AUDIO APPS
By default adding an audio unit/app renames the track to the name of the app which can mess up audio file associations.
Especially when you have a template loaded with tracks named. BASS, DRUMS LEADS PADS etc…
Then when you reload the project later and it re associated the Audio app/unit especially from AUDIOBUS, all tracks get renamed to the name of the app on the track so that any tracks that where previously named BASS LEAD PADS DRUMS etc. those labels are gone and audio files associations are messed up.
MAJOR MAOR BUG needs fixing
(Fix would be to stop tracks from being renamed by these apps)
Thanks.