I have two RV042 routers connected with site to site VPN. The VPN seems to work because I can reach shares on a server from the remote site. AD has stopped working because it is unable to contact the remote site server. If I disconnect the vpn it re-connects and I am able to ping each server from the other. After about 5 minutes or so ping stops working and I ave trouble with AD again. They are both running firmware 18.104.22.168-tm. Any idea on way ping will work then stop?