Q: Canon MX870 fails to print half way through job

Hey guys,

My Canon MX870 fails to print halfway through every print job that it receives, I get the error:

Support Code : 306 A communication error has occurred. Make sure that the printer is plugged in, powered-on, and properly connected to your computer. Then try printing again.

I'm printing from an iMac with an Airport Extreme as the router. Any ideas?

Thanks Will