I have had similar problems as Djaco in the last few weeks. I have reset printing systems, defaulted printer to factory settings, downloaded software and driver again, and connected it directly to Time Capsule. I have finally discovered if I turn the printer off and back on it finds the connection again, but that defeats the purpose of wireless printing. My biggest issue now is that I cannot get the printer to print double-sided as I did before. I have gone into several programs to change the default preset to "scale to fit" and US Letter- double sided. I used to be able to just check or uncheck the Two-Sided print box but now can't get it to print double-sided at all.
MacBook Pro, Mid-2012, Yosemite 10.10.3