Why would a computer keep going off in internet by itself

my computer will go off the internet after a few minuets use, i have called my provider, dell and mircosoft. afer hours of waiting and a new mother board it still does the same thing can anyone help, the computer is less than a year old
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  1. If your ISP, Dell, and Microsoft cannot solve this problem, I think you have a big problem!
    What type of internet connection do you have? A little basic info about your system would be a wonderful thing.
  2. i had the same problem. for me it turned out the onboard lan was dying.
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