"use" key randomly will lag, freezing the ability to open chests/barrels, ride horses, breed animals, etc, etc. After 2-5 minutes of this the game tries to do everything you have clicked on with the "use" key at one time, causing multiple inventory screens to pop up over one another. After that the game just puts me back where I was before the lag happened and reverts back to then, not saving anything done in the meantime.