Huarahunga:
Where exactly is it that you can hear them (coordinates on the map, or under the mini-map in the mouse and keyboard UI)?
I don't recall anyone being hidden around there that need a high perception to see.



BlueSialia:
Unfortunately, that does indeed sound like something corrupt in the save, that doesn't cause an issue with the initial load, but will when triggering the 'cleaning up session' procedure.

Do you have any previous save that you can load and then reload (or return to the main menu, etc)?

Please email supportdos@larian.com with your latest save (or a Dropbox or Google drive link, etc), and if available the most recent save that is fine and oldest that crashes when reloaded. If you are using any mods, also include a list of those enabled and/or the modsettings.lsx from your profile folder.
Each save is a folder in the '..\Documents\Larian Studios\Divinity Original Sin Enhanced Edition\PlayerProfiles\<ProfileName>\Savegames_patch' folder.
In Windows Explorer you can zip a file or folder by right clicking on it/them and selecting 'Send To | Compressed (zipped) Folder'.