Was then browsing the automation module and the connection dropped.
What automation module?
X-10, UPB, Z-Wave and Zigbee modules / controllers are connected via serial link.
It could be that your Ethernet chip on the board is starting to fail. That said it can get "constipated" due to the traffic on the LAN.
The Ethernet port is 1/2 duplex 10Mbs. Some folks have connected old 10Mbs switches to the Ethernet port on the HAI board.
Personally here use a Microrouter on the Ethernet Port (Years now).
Here is my DIY for using a Microrouter. Note this is what I used when I had the intermittent disconnect issues.
Any old router will do for testing.