Hello,
I have the same problem on my A2 revision. I have made some tests and I can't see what is wrong. I even tested by requesting the printers on 2 computers exactly in the same time. One had the printer, and the other couldn't. (so it is probably not a dead lock).
When I have the problem, one computer (1) has the message telling that it is trying to do a connection (so the problems seems to be there between the request of the lock, and the losk is accepted) and on the other computer (2), I have a message telling that the printer is used by another computer (the computer 1).
The printer is "Epson Aculaser C900".
I don't use WIFI at all (disabled). If someone want, I can post a backup of my configuration
Also, all was fine with the firmware 1.21.
Thank you
Marc