I am having real trouble with one VPN tunnel between 2 RV042s. Each RV042 has several tunnels to other locations which are generally OK. But the tunnel between the 2 (which, perhaps not coincidentally, is the busiest tunnel of them all), randomly drops the VPN connection. It seems like the problem has been getting worse recently though that may just be because I'm paying more attention to it. I've tried just about every permutation of encryption/authorization/life times/DPD/Keep-Alive/etc. and nothing seems to make any difference at all. Sometimes the tunnel will stay up for several hours, but sometimes only a few minutes. Reboots don't "fix" anything, they just cause a tunnel reconnect which may or may not last. One router is running f/w 220.127.116.11-tm and the other one is running 1.3.9. I am thinking about trying to upgrade the one running 1.3.9 but it is remote (see separate thread) and I'm not sure it will really make any difference anyway. The strange thing is that each of these routers has other tunnels to other RV042s running various f/w versions, and those tunnels work just fine, no drops. Are "busy" tunnels more likely to get dropped? If so is there anything I can do to address it?