We currently have 15 customer support agents working from home. The setup they have is an RV180 small business VPN router at the agent's home, connected to a cable modem on our plant (we are a cable company/ISP). The RV180 has an IPSec site-to-site VPN back to the corporate office's ASA5520. Randomly, the RV180 will intiate a Phase I rekey, and for some reason the RV180 and ASA5520 can no longer communicate. I know the cable modem connection is not dropping, as I can get into the agent router from the corporate office. After 15-20 minutes, the RV180 does another rekey and everything comes up. I have RV180s on 18.104.22.168 and 22.214.171.124 firmware that both do this. The ASA is running 8.3(2).
Anyone seen this before? I'm considering an update to the ASA OS, but I have no idea if that will take care of it. I have also seen the two rebuild the tunnel with no errors, but not pass traffic until another rekey happens.