I made a video that shows what's happening. Sorry for the low quality (and for not editing out the loading screen).

http://youtu.be/XvsJVQ9HhRE

When using the mouse to move the camera, every five seconds or so, the camera freezes for a split-second. However, during this instant when the camera freezes, the game is still processing input from the mouse, so every few seconds, the camera will freeze, then jump to catch up to where the mouse moved. I use the camera to control which direction I'm moving in when running, and this makes it extremely frustrating to do that.

This does not happen when controlling the camera with the keyboard or gamepad. I've tried two different mice with the same result.

Date & Time:
March 29th, at around 7pm EDT

Frequency:
Always


PC Manufacturer & Model Number:
Homebuilt Computer

Operating System:
Windows 7 x64

Graphics Card:
EVGA GTX580 (SLI - 2 cards)

ISP:
AT&T

Type of Internet Connection:
DSL