I didn't see radvd hourly in the log, so I made the assumption that it was not used anymore. But I do see it started in the startup part of the log now.
Anyways, looks like I'll have to turn off IPv6 to figure out how reliable this router is. Too bad that IPv6 isn't reliable, though. Not that I need it at the moment, but I'm reading more articles about how low the world is on IPv4 addresses. I know that we'll be using dual stack as long as we can, but at some point, unless we start a more layered use of IPv4 addresses that's going to be over. So when I buy a router, IPv6 is something that I look for.
Took Netgear a while to get it right on their R7000 firmware, but now it has worked fine for me for a few months. Sad that Asus hasn't been able to do as well as Netgear in that area. IPv6 works fine on the WRT1900AC as well, although it did drop once on me on that router early on. But stayed working for the next week that I used it. Even tomato ARM, in "beta", has a very solid IPv6 implementation, at least on the R7000 it was solid. Inherited from the MIPS architecture implementation, no doubt *smile*.