New log:
LibreELEC log - Pastebin.com
(had to remove a bunch of 'DEBUG: CMMALRenderer::RenderUpdate - bypass: clear:0 flags:0 alpha:255 source:0' and 'DEBUG: CMMALRenderer::Update' or it was too big for pastebin)
Used a new uSD card, clean install, did some basic configuration and just installed the 'Exodus' repo and add-on.
Problem still manifesting, after 3 minutes audio gets out of sync.
Playback started at 10:37:37, stopped at 10:41:21
I didn't change a thing when upgrading from OpenELEC (other than the update itself) and it was working fine!