dlink 825 no wireless access for Windows 7 computers
Dlink 825Optimum (Cablevision) cable internet
Wireless enabled, all default settings, WPA password set. I have not made any changes to the dlink.
Recently, my dlink 825 began giving a limited internet access error on my wife's & sister's work computers (different company, windows 7 on both).
It sometimes shows no wireless connectivity, once in a while limited connection, and once in a while a DNS error.
These computers used to work via wireless all the time, no issues.
Resetting the dlink router sometimes resolves the issue for about a minute, then wireless will disconnect and give the same issue.
Resetting the cable router does nothing.
Rebooting the computer does nothing.
The same computer will have internet access on a hard cable to the router.
All phones, tablets, Xbox, Wii, bluray, printer still work via wireless. Mac laptop works via wireless.
ISP checked modem, all good. Cable from modem to router checked/swapped.
Dynamic dhcp
Nothing near wireless router (5 ft us closest item)
Any ideas?