Have you checked what page size you're sending.
I know from experience that Xerox lasers can become very stroppy if you, for example, send a Word document in "US Letter" format, to a Xerox that's setup for A4. Same in terms of paper type (e.g. sending a "plain paper" job to a "heavy plain").
There are probably ways to set mismatch settings in firmware. But out of the box, Xeroxes can be fussy.
Disclaimer: My experience is with a 6250DX which is a somewhat different beast to a 6110.
Also, when you said you "tried updating software" .... I assume this is drivers on your Mac ?
If this is the case, would suggest you check Xerox support for printer firmware updates.