Bump for idea's.
I seriously have no idea who i should contact for further help...It's not a hardware problem, thats prooven by the fact that the same problem is happening with three different routers, from three different companies. It's not an ISP problem, they've had no other complaints of this kind, and from what they can see, no required settings have been altered, and there is no fault on the line.
So...Where do i go from here? Im completly confused beyond belief.