Sophos XG Bridge. Mode, DHCP for VLAN takes Multiple Tries Before Getting an IP

Hi.

I've been battling this for days and finally decided to post it here and seek help.

I've pfSense as the main router and Sophos XG is in bridge mode (for application filtering purposes). There's 1x VLAN involved. The DHCP works fine for the main LAN, but for VLAN traffic, it takes at least a good few tries (if lucky) to get an IP assigned. The devices that are on VLAn, even with a static IP take forever to get through and have an IP finally assigned. I tried to capture the packets using Wireshark and the device keep broadcasting Discovery packets but doesn't get Offer back, and no response... The response happens automatically after a very long delay, and no matter how many times I try to reconnect the device to the VLAN network, it just doesn't work and the IP assignment fails.

I've bridged in the interface, even tried DHCP server relay, even played with the FW rules, and did pretty much everything I could find on the forum for similar issues, but nothing works.

Any help will be much appreciated.

Thanks.

Thanks.