Purchased the RVS4000 in 11/2012 to work behind a NVG512 in (pass thru mode). I'm running firmware version V126.96.36.199. For whatever reason once or twice a month I lose access to the internet. Sometimes it's AT&T fault but other times my RVS4000 dosen't behave well. I finally took screen shots of every screen I configured in the RVS4000 to make it work in my environment. Last night we lost internet access again. Before unplugging everything I looked in the RVS4000 and found that my WAN setup had reverted back to a default Automatic Configuration - DHCP instead of the Static IP that I had previously saved.
It seems that my RVS4000 is losing just that WAN setting (port forwarding and Static IP Mapping data and VPN client data is still intact.
Any hints on what to do next?
Walter, it sounds like the unit may be faulty. If the device is completely locking to the point DHCP stops responding and the router UI is not accessible, sounds like a device lock up.
If you want to debug it further, you can set up an external syslog server to see the why. But frankly, sounds like some bad hardware.
I'd recommend you give the SBSC a call for a possible replacement.