It seems like ebay may be blocking the ip address your equipment had been using. When you shut it off, then powered back up it connected to your internet provider and got a different ip address assigned.
You're internet providerassigns an ip address to your router/modem when it connects to the isp network. This ip address is assigned dynamically by some setups each time the router/modem connects, on others you get the same ip address all the time. Sounds like just switching your equipment off, then back on will get you a different isp. When you post a message here on NLG you can go back and look at it after it gets posted and you will see your ip address in the lower right corner of the message. On my internet setup if I switch it off and back on shortly afterwards I will get the same ip address, no change. But if I leave things off for a longer period of time when I turn it back on I get a different ip address.