Wan-Link Manager shows wan down, but in reality its up

Could this be some sort of  ARP problem? Maybe you could try to add a static entry:

1) go to the cli, ping your gw an get the MAC address:

ping 192.168.0.1

arp 192.168.0.1

? (192.168.0.1) at 33:44:55:66:77:88 [ether]  on Port2

2) Add a static entry via WebUI:

https://docs.sophos.com/nsg/sophos-firewall/19.0/Help/en-us/webhelp/onlinehelp/AdministratorHelp/Network/Neighbors/ARPNDP/NetworkStaticNeighborAdd/index.html

Could this be some sort of  ARP problem? Maybe you could try to add a static entry:

1) go to the cli, ping your gw an get the MAC address:

ping 192.168.0.1

arp 192.168.0.1

? (192.168.0.1) at 33:44:55:66:77:88 [ether]  on Port2

2) Add a static entry via WebUI:

https://docs.sophos.com/nsg/sophos-firewall/19.0/Help/en-us/webhelp/onlinehelp/AdministratorHelp/Network/Neighbors/ARPNDP/NetworkStaticNeighborAdd/index.html