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When you say freezing, what are you actually trying to tell us? Is your mouse unresponsive for 3-4 seconds? If you're watching a movie does the movie literally stop working for 3-4 seconds as if it's on pause? Have you checked task manager to see if there is a memory load on a process or program when this 'freeze' happens? Also provide us with your laptop model, and make sure all your drivers are up to date.