I wasn't sure how to get additional audio logging and asked around, but could not get the commands for what I need. I'm waiting on our Audio SME to come in (different time zone) to see how I can get additional information for this bug. I'll update it accordingly.
In the mean time, I tried several game console commands for stat groups. Attaching images of those before and after restart track.
In game music doesn't load on restart. Other audio elements either work briefly and stop or do not work at all.
Game performs the same as initial start up after restart.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-40850 in the post.