Thanks Ray, No didn’t buy via the German distributor, purchased directly from your website.
Typically we would use DHCP, however in this instance we are unable too (All of our other 10+ OpenSpinklers are DHCP assigned). There isn’t a IP conflict so that isn’t causing the issue, it just seems to be hit and miss between which adapter it selects on startup (Wifi or ethernet). Given you have a Static IP as an option, I thought the problem should be something that you would want to be aware of. Unless there is a fault with our unit, it should be fairly easy to replicate.
On a side note, I don’t believe there is an option to specify a Subnet Mask when assigning a static IP address, seems an odd thing to not be able to specify.