I am on the forum for the same issue; OS2.3 with 2.1.7 FW. The NIC shows a link light and activity, but I cannot access the web portal. The unit does continue to function, and the zones water. I’m trying a firmware upgrade to 2.1.9. It can take hours or weeks to hang. I’ll update when the problem reoccurs with 2.1.9 or when I’m confident the problem is resolved.