Dlink Dir-657 keeps losing internet connection on wifi devices only . the connection remains to the router but no internet .if I disconnect the connection i am unable to reconnect to the router until i reboot it. My internet remains on my network cabled devices .I am running on an empty channel 3 , usually happens 20 to 60 minutes after the router is up . Dlink sent me a replacement refurbished one and this one is doing the same thing . I owned the original one for about 5 months with no problems at all ,no new electronics in the house and have not changed the placement of the router . Any help would be great ,before i call dlink back.