Network problem antminer S1 only mines with wifi

All my antminers have the reset button so I reset them to default settings and connect with a browser to the default ip address. Then I change it, reboot and connect with a browser to the new ip address. Config the miner but it wont mine. I am communicating with it fine but it wont mine. I started a wifi connection to see if it would mine this way and it started mining.

So now I 1st set up a cabled connection between my router and the antminer to perform initial setup and get the wifi running and they don't mine until the wifi is going. I am pretty network challenged. Anybody know whats up with only being able to mine with wifi connection? They all have both a cabled connection with a fixed ip address and a wireless connection where DHCP assigns the ip address. Weird. I don't get it. :-P