problems with printer wireless

First of all let me say right off the bat that I don't think this is an Ubuntu issue -- it's just that I've always gotten such good advice here that I wanted to see if anyone has insights on a printer wireless card issue.

I have a Lexmark PinnaclePro901 that's connected to my wireless network. Most of the time it works just fine. But once in a while, usually when I haven't used it for a day or two, it suddenly stops responding to ping. When I restart it, everything's fine again. Obviously not a huge issue, but kind of annoying, especially since the printer takes a while to shut down and restart. Any ideas much appreciated.