I've made my own camera warning files, scout_100.wav works fine but scout_500.wav doesn't play during navigation, it's OK when played manually. I have the 1000 warning off in settings.
The new 500 file is 100k vs around 40k for the original don't know if that's an issue.
Fixed! My scout_500 file was corrupted but I was able to repair it with the convert function of VLC. Using the simulate route option shows it is now OK.