CDDB server error message

I just received my new Slink-e yesterday and it's really great. I have two questions. It has catalogued most of the 350 CD's on my CDP CX-400 player, but then i got an error message reading "CDDB Server Error. Request limit exceeded on all available servers." The same message appears when i tried to do a CD search on my CDP CX-240 player.

Also, I have 3 CD changers (the 3rd one is a CDP CX90ES). What is the best way to hook them together? right now i don't have a mixer and am only able to play 2 of them. is there a way to play all 3 without additional equipment? Thanks.