It now makes more sense to me. When he first got his cable, he wasn't using a router.

But, after he got the router it worked fine until last weekend.

Maybe they upgraded the firmware in the modem...

I'll suggest that he upgrade the firmware in the router.

However, we have fixed the problem. I just put in another NIC and disabeld the onboard he was using before. Now everything works just fine.

Very strange indeed.

Thanks for the suggestions though.