DHCP on WAN interface loses connectivity.

Hi,

I've been trying to test if it's possible to replace my current router with SophosXG home edition. But i see some strange behavior on the SophosXG, the moment i installed it and gave my cable modem a cycle it received an IP. after X time all of a sudden i lose connectivity with the internet. If i check the WAN interface it claims to have a DHCP address, but if i try to refresh it or switch it to manual and back to DHCP it doesn't receive the address.

If i run DHClient on the command when its working i get:

execve (/sbin/dhclient-script, ...): No such file or directory
execve (/sbin/dhclient-script, ...): No such file or directory
execve (/sbin/dhclient-script, ...): No such file or directory
execve (/sbin/dhclient-script, ...): No such file or directory
Listening on LPF/Port2/00:15:17:54:b8:4d
Sending on   LPF/Port2/00:15:17:54:b8:4d
Listening on LPF/ipsec0/86:2c:9f:7a:4c:91
Sending on   LPF/ipsec0/86:2c:9f:7a:4c:91
Listening on LPF/GuestAP/f2:66:d6:f4:d7:6d
Sending on   LPF/GuestAP/f2:66:d6:f4:d7:6d
Listening on LPF/Port1/00:15:17:54:b8:4c
Sending on   LPF/Port1/00:15:17:54:b8:4c
Sending on   Socket/fallback
DHCPDISCOVER on Port2 to 255.255.255.255 port 67 interval 6
DHCPDISCOVER on ipsec0 to 255.255.255.255 port 67 interval 7
DHCPDISCOVER on GuestAP to 255.255.255.255 port 67 interval 8
DHCPDISCOVER on Port1 to 255.255.255.255 port 67 interval 4
DHCPDISCOVER on Port1 to 255.255.255.255 port 67 interval 10
DHCPDISCOVER on Port2 to 255.255.255.255 port 67 interval 9

But when the connectivity drops and i run DHclient -v again i'm missing the lines related to port2 which is the WAN port. It's almost like its gone? Does somebody have any experience with this? The XG is in routing mode straight behind my cable modem which is running in bridge mode. (Only if i cycle my modem again does it receive the address again, until it drops again....Which is unacceptable.)

Please help :D