I'm SO glad I found this page.I've been having this issue for months. It feels like it coincided with updating to 2021. Exporting videos, whether three minutes or 20, the exported file starts off fine before completely losing dialog (not music ever, weirdly) at completely random places. Or it'll export and be 100 percent OK (this is a rare occurence).

It's incredibly frustrating and makes it impossible to trust Premiere. I sincerely hope they fix this soon. It will sometimes take a dozen or more export attempts before Premiere manages to do its job. I'll try the .wav solution in the meantime.

Thanks for making me not feel like a complete crazy person! For clarity, I'm on an AMD rig with 32 gigs of RAM running Windows 10 and the latest version of Premiere (at the time of writing), 22.0 (Build 169).

Same here, updated version, windows 11 and 32Gb RAM....very very annoying. Please have a look on this bug

Yeah, it also happens with me when exporting MOV files (AppleProRes 442). Some parts of the audio are off. Even some parts of the image.

I want to sleep but i can't because of this

This has happened again this morning for me. I am taking a previously rendered movie. Dropping it into a new sequence and re-rendering it. MP4. First 40 seconds I had audio, then no audio for the rest of the 10 minutes.
I then did the exact same thing and the second time it has all audio.

This is also happening to me quite regularly. I'm running everything on a modern PC with up-to-date Windows 10 and drivers. It mainly seems to affect videos > 1min in length, but occasionally messes up shorter exports too. Often I will hear audio for about a second, then it cuts out. Sometimes no audio for the rest of the video, but sometimes it will come back after a minute or two, leaving just a section of the export without audio.

Re-running the exact same export will either change the position where the audio cuts out, or if I'm really lucky I get a good clean export I can keep.

Exporting the audio separately as some people have suggested is very frustrating for my workflow.

Given Adobe has switched to a SaaS model, I hope there's a fix very soon. Looking at the timestamp of the original post here I can't believe an issue like this has persisted for a few months in a pro tool like Premier.

I've experienced the same issue. Random audio drop outs - first minute might be fine, and then silence. I can't pin it down to what causes it, I just have to quickly skim through everything I export to make sure there is audio where there is supposed to be

I'm having the same issue. I can export the same video several times in a row and have different portions of the audio missing each time. Very frustrating.

UPDATE:
Exporting the WAV and reintroducing that to the video has done the trick. Really shouldn't have to do that as a workaround though...

In the export window, there are two check box options about a third of the way down with 'Export Video' and 'Export Audio'. I noticed my 'Export Audio' box wasn't checked, when I checked it the video exported perfectly with the audio.

Any fix to this? I'm having the same issue and I've tried so many different things with no luck. Made a post over on the Adobe help site and they stopped responding ...

Any reliable fix except for exporting the audio individually?

I am having the same issue as everyone else, it is very annoying especially when I thought I turned off Auto Updates because there always seems to be bugs like this. Trying out a method where I exported a .WAV file and just plugged it into the timeline hopefully this works as a work around.

UPDATE: IT WORKED! Exported a 8 min 4k video with the wav and no issue were found. I hope this helps people down the road until they fit the issue.

I'm having this problem too since I updated from version 2020 to 2021. I already updated several project files so I can't really go back to 2020. Every time I change something and export media, random audio from clips are missing. I tried clearing cache and preferences, and removed the roaming user data cache. That didn't help. So annoying.

having this same problem

I'm having this same issue. The most frustrating part is that if you export it again immediately... no changes... it MIGHT export perfectly.

any other solutions?

When exporting a video sequence premiere randomly leaves out part of the audio. Those part were not muted, but in the same channel and of the same kind of other parts exported fine, not even cut: so for instance you have a talker that randomly get the voice silent.
This is a big reliability issue, because there is no correspondence of what you have on timeline and what you are going to have on final export. This happens on different machines and happened also with previous versions of Premiere different from this one at moment of writing 15.4.1 (build 4).
The only reliably working workaround has been export only the single audio channels in wave files and then import it back into the timeline, that is time consuming and unacceptable for a professional software.