Yes you are absolutely right.
I have been stupidly signing out of the app when finished with a session.
This has the effect of uninitialising the connection.
Indeed the sign out page warns that you will not be able to connect.
Now I have eyefi working fine.
Can you explain why I need to sign on to the internet to pair up my camera with my phone?
I would have thought this could be done between the phone and camera alone