Looting - Loot Window

After killing a creature or NPC, the loot window will flash, open and close quickly. Pressing the the mouse button down will flash the loot window. It is repeatable. From the bodies radial menu, selecting Loot will do the same thing, flash the loot window.

If the cursor is moved away from the body, moved back to the body, pressing the mouse button will open the loot window.

The problem appears to be random