RV180W loses port forwarding rules when switching WAN connections

We have a backup WAN connection in our office, but we switch this connection manually on our RV180W when the primary goes down. Our normal connection is ADSL with PPPoE, and the backup is Cable with DHCP.
However, we also have some port forwarding rules for our VoIP PBX (UDP port 5060) as well as SSH, and these rules seem to stop working completely when we switch our WAN connection to our cable connection. We can still surf the web from our workstations, but our incoming phone calls and SSH connections all cease to work completely. The problem does not persist after we've switched back to our normal ADSL connection.
This behaviour is completely bizarre and suggests that there's some kind of bug in the Cisco RV180W.

helm,
I'm sorry, I wasn't clear which IP address renewal I am speaking about.
I believe that the problem is caused when the router renews the WHS's local IP address (192.168...). My WAN IP address remains unchanged througout the tests I performed and the problems I experienced.
The very act of changing the local clients' lease time in the router's configuration causes the forwarding to be lost immediately. (I am gusessing that when the lease time is changed, the router immediately renews the lease and begins a new countdown.)
(In fact, I might go as far as to say it is a bug in the firmware, but I haven't done enough testing to nail it down.)

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