Audio disapearing from random moments in clips

I’m currently working on a big project that I’ve nearly finished. I’ve come back to re watch the whole video to make sure everything is okay only to find out that audio from certain parts of certain clips have just disappeared. the video is still fine, but the audio is just gone and the voice just suddenly stops, it was there before and is still there on the video outside of premiere pro, so I’m not sure why this is happening.

It actually baffles me a billion dollar company cares so little about its subscribers that they cant even make a reliable product, how do they manage to <deleted-kglad> break something new or bring in a new bug every update?

Does anybody know a fix to this?