Larry,
I cannot vouch for a fact your RV is not faulty; but my 2 x RV042's, essentially the same hardware, just extra ports, (connected to 2 x VDSL 10Mb ISP links) display a similar behaviour. The ISP (Transact, here in the ACT) support staff state categorically that "if you have assigned static IP's, it is still highly recommended that you set your router to DHCP."
I am no CCIE, so the intricacies of that order of networking are still a little above me (Large ISP's et al) - so it may only be an ISP centric issue, but I have had to run like that sincing replacing my old Netgear VPN routers with RV042s 2 + years ago...
Rob