In the past few days I have had intermittent problems with lagging response to controls. When I press W to start forward movement the character may continue to move in the same direction even when the key is released or the mouse is moved for a turn. This has occurred while running, sprinting or riding a horse. The lag even affects lock picking, as the pick is slow responding to mouse movements. This has been occurring repeatedly during the same game session and can continue even after exiting and reloading the game. My PC has been running the game with high settings since 1/2016 without lagging issues.