the first thing to do is contact your ISP(internet service provider) and see if the problem lies with them(most likly), if not then try reinstalling your browser, maybe you had a problem with it(if your using IE then it might be hard to get a new copy so I recomend installing firefox instead or installing IE to a different partition of your harddrive and testing it there).
other than that I can't think of any probs.
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If you're using a wireless internet connection, this can happen if your connection is poor or inconsistent. If you're on a hard-line, disregard this. If you are on a wireless internet, you should moniter your connection details and see what your average signal rating is. If it's poor, consider either moving your computer or router to a more effective wireless configuration (ie don't put your router near large amounts of lead, humidity, other wireless devices, or near a window) or you can consider getting a better router or a signal boosting aparatus.
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