No, this has happened three times, once with IP v6 only addresses to my entire network, the router wouldn't even assign an IP v4 at all (over 20 devices). Second time was IP v4 class B being assigned to a wireless laptop, and this time class B assigned to a phone. Every time, the router shows the devices in the device list as though they are connected to the router, but obviously they do not talk. In both instances, the wireless devices are only one room away, there's no way its an interference / connectivity issue
1st time was 1.13 firmware (previously reported), 2nd time was 1.13 firmware, 3rd time 1.20 firmware