I've had exactly the same problem with the same printer.
I too am running Windows 8 64-bit, and it also runs fine when wired up.
The problem is sporadic, sometimes it prints the whole page, but often skips the bottom half or third. Interestingly, PDFs have printed ok, but Microsoft Word (2013) docs and IE print-outs often have issues. The issue can happen on text alone or text/image pages.
Generally things are running well but it's quite annoying! Any help would be appreciated.