Flaky L2TP port forwarding flakiness

I have a brand new  that I bought because I needed the ability to set up ipsec tunnels.  The first step was to replace the linksys wifi router we had with the edgerouter and get it working as a drop in replacement.

First I ran the Load Balancing wizard.  Then I set up port forwarding for L2TP and openvpn to pass that traffic from the edgerouter to my vpn server. All config thus far has been done via WUI.

Since moving to the edgerouter, users have been complaining about "flaky" connections for l2tp (openvpn TBD)

I am not really a network professional, and I have no idea where to go to start troubleshooting this.  Help would be immensely appreciated.

Full config attached. Here are the parts of my config I believe are relevant:

------------------

name WAN_IN {
default-action drop
...
rule 20 {
action accept
description "L2TP ESP datapath"
log disable
protocol 50
}

...

port-forward {
auto-firewall enable
hairpin-nat enable
lan-interface eth2
rule 1 {
description "openVPN to nas"
forward-to {
address 10.10.0.22
port 1194
}
original-port 1194
protocol tcp_udp
}
rule 2 {
description "L2TP IKEv1 to nas"
forward-to {
address 10.10.0.22
port 500
}
original-port 500
protocol udp
}
rule 3 {
description "L2TP IKEv1 to nas"
forward-to {
address 10.10.0.22
port 4500
}
original-port 4500
protocol udp
}
rule 4 {
description "L2TP unknown to nas"
forward-to {
address 10.10.0.22
port 1701
}
original-port 1701
protocol udp
}
wan-interface eth0
}