380.59 was solid with IPv6 on Comcast with an up time of about 15 continuous days, but 380.60 beta 1 has been a little wonky. It'll lose connection, and requires a reboot of modem or router to come back. Not entirely sure it's the solely the router, but there's definitely an uptick with 380.60 beta 1. Everything else (OpenVPN, Samba, etc) has been rock solid as always.