The yellow notification isn't poping up (turrets engaging enemy) and no sound is playing. What do happens is the red notification poping up (entities being damaged), again no sound. A sound plays when an entity is destroyed.
Edit: Tested it on 1.0, apparently there is no ...
I don't know why it's happening, but random items (belt/inserter/furnace/...) get marked for deconstruction. It's stopping my production. Don't know how to replicate it, just place items.