I am pretty good at computers, but this one has me at a loss, maybe you all can help.

So I have a computer that was working really well but for the past 3 weeks in terms of internet I suddenly had issues.  We have other computers on the same network that are getting internet fine.  I have had three different cable company technicians come out and test everything and it all came up as working fine. 

My computer internet connection will sporadically stop working for a few minutes, then all a sudden come back for a few more, then I lose it again.  I am on a wired network (cable modem > Router > my computer)  When it cuts out, I don't do anything and in a few minutes it comes back.  I have tried several websites to be sure it wasn't the server.  I check my router and there aren't any conflicting IP addresses. 

Sometime the internet connection icon in the tray will signal an issue, but then fix itself (though I still don't get internet).  Most often the computer doesn't detect a issue, I try the diagnose feature, but it never finds anything.  I have done all my windows updates and updated the internet connection drivers to the most recent stable version.  I also ran spybot search and destroy and some others and it came up clean, plus I am pretty careful.

Specs:
Dell XPS 8100 (1 month old)
Wired internet (Dlink router EBR-2310)
Windows 7 all current and up to date
High speed cable internet