After completing the first Shangri-La quest I started experiencing a bug/glitch when moving and a general reduction in frame rate. When walking/crouching/sprinting and holding forward my character will slow down and eventually stop moving. I continue to hold forward and the character just stays still. This doesn't happen when strafing or going backwards. Even when the problem isn't happening, my frame rate is inconsistent and the game looks choppy. It all started after that Shangri-La mission, though it could merely be a coincidence. Can anyone offer a possible solution other than starting the game over? I already lost a save when transferring data to a new console so my motivation is already waning. If starting over is the only solution can this just happen again at the same place or randomly as I play through?