GL-AR750S Slate VPN won't reconnect (icon yellow)

[Almahadeus]

VPN dropping when GL,iNet is the second NAT

Anyone has any ideas why I keep getting OpenVPN and Wireguard clients (I use Torguard) frequently drop internet connection once my GL.iNet Brume router is set in DHCP mode, behind my main home router? This is despite trying to 1) open all ports on the main router to point to GL.iNet IP’s address or 2) putting the GL.iNet in primary router’s DMZ and then confirming all traffic going to the GL.iNet with no problem. Interestingly the problem completely disappears and the GL.iNet and its VPN functi…