I duplicated this as well.

Do this shooternz (and others):

Take a video clip and a couple of audio clips and put them on the timeline. Don't be picky, you are not going to either watch or listen. If you selected audio and video from the same clip, make sure to unlink them.

Line them all up at the beginning of the timeline.

Zoom all of the way in at the beginning of the timeline

Change the view to Audio units

Select the audio on track one and using your numeric keyboard, type the + sign and 1000

Select the second track's audi and type +2000

They should all be starting at a different point in time

Uncheck audio units to go back to frames.

Select all tracks and drag one frame.

Zoom back in using Audio units

See a problem?

By the way, this research has crashed my Premiere Pro twice now.

Basically, the audio must be trimmed to begin at the start of a frame. Or it will shift to accomplish that goal without your wanting it to.

The main problem I see is that my second frame starts at 1601 audio units, the second at 3203 and the third at 4804. I guess it is OK. Just jump at 1600 units and multiples of 1600.  I figure that 48000 divided by 30 is a nice simple 1600 - but 29.97 causes a problem. It comes out to 1601.6 - so if you are really going to do this right, use 1601.6 as your number. If you are a complete lunatic or the clip is very long, use 1601.601601601602

-- Steven

@Allthingswestcoast

Any progress on this issue - just replicated the same thing. Hoping somebody has figured this out in the last few months!

@shotternz

Doesn't help the above described issue. I did find a workaround though - saw it on another thread. Making sure the front end of the clip is snapped to frame, I then go into audio units and use the slip tool to align the audio more accurately. At that point, I create a subclip of the audio and redrag back in over the top of the original. This seems to remedy the original issue, but it sure is a few extra steps. If anyone has a better suggestion, I'm absolutely all ears.

@Gotz

You did of course say to start the audio at the beginning of the frame. In my workflow, I did just that. Audio was snapped to frame before making any other adjustments. It was then that I went to audio units, made adjustments using the slip tool, and lined up my lav's and boom to the camera reference audio. I then switched back to frame and continued to edit. Using the track select tool and ripple edit tool with snap turned on in frame mode, I noted that after moving the audio files on the sequence to another location, the two audio tracks had moved in time. The beginnings of the audio files were visually still snapped to frame. I replicated this a number of times, but couldn't come up with a workaround until I created a subclip.

I wasn't trying to question anything you said and I certainly could be missing something within my troubleshooting or problem solving process. Like I said, I'm totally open  to whatever I've missed here!:)