Issues with Double Nat

[Funbagin]

Hello all,

I think my issues are stemming from double NAT but I am not sure.
My current setup Modem (bridged) - wireless router 192.168.1.1 (DHPC)(DMZ 192.168.1.27) - PFsense (DHCP(With VPN)) WAN 192.168.1.27 LAN 192.168.2.1 - 8 Port switch

So currently most of the devices on my network are connected to my wireless router, and I have a few devices connected to the switch to use the VPN I have setup on my PFsense box. It seems like all is well for a day or so and then I start having very strange network issues (even with the devices connected to my wireless router), and I dont want all my traffic going through the VPN due to speeds and pings (for gaming).

(Incase anyone is wondering) The issues I start having is random slow speeds wired and wireless, and devices not connecting to the internet at all while others are connected and working fine.

I understand (kinda) what double NAT is, but I am not sure if thats my issue. But in the case that it is would setting up static routing on my PFsense box and disabling DHCP fix my double nat issues? If not is there another solution?

Thanks in advance for any help with this issue.