Hi. I bought the white Macbook when it came out 2 years ago and haven't had many issues with it. However, for the last 6 months I've had repeated issues with it freezing and taking a long time to load web pages. Especially when there are a few open. The reason I chose a Mac is that I was told that you should never suffer with these problems, which is what kept happening on Windows laptops. When I run Onyx it is fine for an hour or so and then it starts up again. Is there a way I can stop this happening. Thanks.