I had to dump my network and start again from scratch after introducing the superdud. It worked for a day or so then the wireless problems started, the dropped internet problems started, software firewalls went haywire, you name it, it happened. Complete melt down.
So IMO you might be able to save yourself some headscratching by starting again rather than trying to solve the LAN problems.
The superdud wireless is inherently weak
and the auto setting doesn't seem to work. Manually optimising channels with the aid of an app like InSSider helps as does switching the 802.11 mode to 145mbps.
Heavy activity on the LAN can cause it to reboot, mine reboots itself up to 3 times a day completely spontaneously.