So you've actually tried with a different router, and nothing changed?
Skimming over this thread rather quickly... I see everyone gradually narrowing down the possibilities, and then when the conclusion winds up at the router, you suddenly have some secret knowledge that apparently exonerates the router, but you refuse to share it.
Suppose it's no skin off my nose. I'll just go back to ignoring this thread like I do every other one where the person asking the question isn't really interested in the answer. I figure when they've become sufficiently annoyed by whatever the problem is, they'll be back with a more open mind.