Sound problems each time when opening a new map

Anyone else having sound problems each time when opening a new map? In my case sound effects and voiceovers become 'muffled'. It happens the instant I create the map instance (before entering into the map).

Exiting to character screen and back again fixes the issue - until I open the next map.

This problem was not present in the campaign or a few patches back. (maybe it was introduced with the loot filter sounds fix??). My sound channel settings are on high.

This has also been happening to me since the last hotfix. I have over 20 hours in maps and this suddenly started happening. Very replicable by restarting game and opening a map. Does not happen in Acts from limited testing.