Thanks for the reply, Im still having the same problem.
I have change the SSID, changing channel in each of the wireless SSID and even I set up reboot the modem every day at 3am in the morning.
Devices that connected to a modem is iPhone, iPad, Mac and WIndows laptop; and I don't have any cordless house phones or WIFI APs, I only have wifi extender to extend wifi range to the entire house.
The problem (WIFI 'NO INTERNET CONNECTION') still persist, even though in the modem configuration page says INTERNET is CONNECTED.
I am not sure what is the problem; hope someone can help.
Thanks in advance.