I have RV120W router with fw 188.8.131.52 or 184.108.40.206 (both version are affected) and few workstations with Windows 7 (32 and 64 bit). There is common gigabit switch between router and workstations. The problem is that all workstations wait for about 1 minute to get DHCP address from router (on startup and when disable-enable network interface). It seems that when router is restarted eg., workstations (which keep previously attached IP addresses - their network interfaces are still up conected to switch ...) are registered in router´s "Available LAN Hosts" list with "static" IP address mark. When you disable network interface on PC now and enable it again, you have to wait for 1 minute to get network interface up with IP address. Only when you use "ipconfig /release" and "ipconfig /renew" IP address is aquired immediately and registered as "Dynamic" within router "Available LAN Hosts" list - until you restart the router. Then devices are registered as "Static" again. This issue occurs only when there is a switch between router and Windows 7 device which keeps device´s NIC up even when router is restarting or down and/or when devices are already registered as "static" within RV120W. I made many tests with RVS4000, WRV200, ZyWALL 5 and others and mentioned case belongs only to RV120W.
Does upcoming new firmware solve this issue?
EDIT: FW 220.127.116.11 does not have this problem!