Thanks for the link Macworth, but it does not make sense at all! I have a dlink dir-625, my previous router before dir-655. I am not a real technical guy, but I will try to explain my point. As far as I understand. Dir-625 and dir-655 use same wireless channels, hence the situation. Both of them are set on the same channel and same frequencies, but dir-655 dies out. This is my real question, but thanks for the link. It really explain the correct terminologies of wireless frequencies.