Random audio de-sync in finished DVD export issue

I have installed Premiere CC 2018 on a machine that previously did not have any Adobe products installed. Our existing workstation has 2015 on it still. For the first project on this machine I created a simple project and exported it to DVD. Everything works fine while in premiere but once converted to DVD the output file desyncs at the exact same spot each time I try again. Everything is fine for the first few minutes and the video suddenly lags the audio by around four seconds.

The audio doesn't seem to have any cuts, drops or pitch changes so I imagine the video changes speed at some point. The source files come from a Canon camera and are recorded at 29.97 progressive. The DVD is mastered at the same settings and with settings we used for 2015. I never had an issue with Premiere 2015 and it's media encoder version. I have not had a chance to try opening this project in 2015. Is that possible with something made in 2018?

I have tried a number of DVD settings, clearing the cache and rendering using the CPU instead of CUDA. I've tried different versions of the audio including those within the video source and separately edited ones. It seems to be somewhere in the conversion to DVD and in the video stream in the output.

What might I be missing? Tomorrow I will attempt to remake the project on the old system to see what happens.