No you are not imaging that - I got lots of sound distortion. So I exported and checked all the sounds in MyLevel and there is a sound (Underwater ambience I think it is called) that is stereo - so this is likely affecting the sound quality and causing your crash (not every game will crash with stereo sounds but they will certainly have an impact on the overall sound quality).
The sounds from the map continued when I closed the map and went to 'New' (so nothing in the Viewports, just the grid) and even continued when I opened another map - I've never had that before! So something very odd about the sounds in the map - there may be something else in addition to the stereo sound. I didn't check the other sounds in the map as these are all default sounds going by the file names.