My N66U, which worked fine for months, gave me problems when I added a wifi extender to the network and along with it maybe 5 more clients. At first I thought it was the modem acting up since I could reach the router but I just had no internet. So I used "Network Tools" on the router to ping and resolve a few IPs which worked. Anyway, l never figured out exactly why but I reset the router to default settings and things worked again even though they were fine before for months. What could've caused this? I'd just like to know in case I have the issue again and no internet support to research it.