The same happen to me, with the Seeed Ethernet Shield V2.0 every time the power goes down i need to ‘MANUALLY’ reset the shield or the arduino, because if i do not the Seeed Ethernet Shield stay on Orange light on the RJ45 and NOT communication are possible! I try with the software reset to go LOW with a Pin connected to the reset Pin but it DID NOT work for go UP the Seeed Ethernet Shield …
This is a big issue if you want to use the shield in remote condition !!
I’m waiting an answer from Seeed Studio Team !! I have many of these shields and that issue make them usless !!
Thanks