I'm having a great deal of difficulty with 2 WRV200's maintaining the VPN for more than a couple days.  The 2 routers will sync, the VPN will be up for awhile and then drop for no apparent reason with no attempt ever to reestablish.  Until one of the routers is restarted (sometimes both) the VPN is dead.  During this time the IP addresses, though dynamic, do not change.  Both routers are set to maintain a persistent connection to their respective ISP, neither router ever sees a drop in the actual connection but the VPNs drop.  Even a constant ping between locations doesn't maintain the connection.  I'm a bit frustrated that the .39 firmware (latest and only since June 2008) hasn't been rev'd to fix whatever issue is causing this.  Am I the ONLY person having this issue with WRV200s?  I can attempt to grab logs from them if I get some response back.  I don't suspect a major configuration issue since the VPNs stay up for a while, just not long term.  This is the first time working with Cisco/Linksys Small Biz Routers and unless somebody can help figure this out I may end up going back to the other brands I've had no issues with and sell these to some poor, unsuspecting soul on e-bay.  I've worked with several other brands that NEVER drop the VPN unless the ISP connection is also having issues and even then 90% of the time they reestablish automatically and with no intervention once the connection is back up.