Wifi as wan2 - A small problem

[firefox]

my pfsense Consists of four network cards

First network card serves as wan1
Second network card serves as lan1
Third network card serves as lan2

Fourth network card is wireless and I have nothing to do with it

I want to use him as wan2

The moment wan1 disconnects
Communication will be through wan2

I have two problems
One of them is related over here

When I set the pfsense
To use the wireless card as wan2

Occasionally it works
And connects for a few seconds

But when it happens
These services stop working off and on
apinger
dhcpd
dnsmasq
ntpd
squid
avahi

Why is this happening ?
how can i fix it ?

[firefox]

Can someone explain to me how to do it
Or give a link to a simple guide