I had this problem with my RT-N56U router. It had been that way ever since I bought it a year ago. It constantly refreshes, and I would get random appearing and disappearing client devices in the list.Updated to .102 from .100, both have been stable so far but, i'm having weird issue with both firmwares that wasn't that before. In the Connected Clients list, its seems always refreshing but only finds the clients present at the time the router rebooted. I wanted to add another client to static HDCP and never see it on that list. i remember before would have 16-18 sometimes 20 clients, now no matter how many clients i have, always shows only the ones connected when router restarted. Also, the clients would have names listed, right now all i see refresh icon going and going. Doesnt seem to affect anything, all the clients not listed work..Anyone seem this?
The Russian made custom firmware for the RT-N56U totally fixed that problem. It was very annoying.