We've got a cable internet modem that gives us no trouble, but due to the number of devices using the internet in our place we finally not long ago switched to a wireless router setup. Everything's near my computer (since I have to fix everything) and the modem plugs directly into the router, which then has a direct Ethernet connection to my computer while the rest of the house gets wireless.
Originally (as in several weeks ago) when I had to get it setup again after coming back from school there was this weird problem where the rest of the house could get internet no problem, but I got nothing with a direct connection through the wireless router. After reseting the router (turns out someone mucked about inside it a while ago when my folks called tech support), everything now works fine: I get Internet and everyone else gets internet.
Oddly enough I'm getting a weirder problem now. First off, I never have any problems. My computer with the direct connection through the wireless router to the cable modem never drops, everything's hunky dory even when the problem below happens.
The rest of the house (everyone, I've seen it drop on the other desktop, my sister's laptop, a blackberry, and my DS so it's not limited to just one item) will have Internet for something like half a day but at least once a day ever since we fixed the old problem, perhaps twice a day, all of a sudden the computers will be unable to resolve an IP from the wireless router. I look inside the router settings and everything seems fine, except no external computer can seem to resolve the address and there's no indication as to why it works fine for hours and suddenly decides to up and quit.
And every time this happens, a simple pulling out and plugging back in of the wireless router's power cord will fix this problem without any hassle. Obviously though this is an irritating way of having to ensure the house still has Internet, so I was wondering if there might be something more permanent I can do to track down why this keeps happening? The router's a D-Link DIR-615 if that matters.
We'll see how long this blog lasts
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A friend of mine with that router had the exact same symptoms you describe, down to how it worked fine for a long time, then out of nowhere it would work fine for wired connections but wireless connections wouldn't work (several hours after the router being restarted, fresh restarts allowing wireless devices to connect.)
I upgraded the firmware which fixed things for him, though the circumstances (working fine, then suddenly not working fine for no apparent reason) are still a mystery to me.
It's unlikely you have the same router, but I figured you'd want to hear that someone else has run into the same and very unusual problem.