I lose my printer on the network after mini goes to sleep

After upgrading to Mavericks I started have two issues. One was that my Apple mail wasn't picking up the mail properly from my Gmail account. That issue has since been remedied by an Apple tech. The tech had me delete my account in Mail and delete some files from a system folder and re-create the account in Mail and the issue went away. The second issue is that my printer is lost on the network every time my mini goes to sleep. The printer is a HP P2015dn. I have have it for several years and it works perfectly when I can see it on the network. I have tried connecting directly to the mini via ethernet and the same thing happens. Every time I want to use it I have to delete it from the printer list, restart the printer, it takes several minutes to appear on the printer list again, and printing works works fine until the mini goes to sleep – after waking I get the error "printer not connected" when i try to print.

I called Apple and they said to download/install the latest driver for the printer but HP says the latest driver is included in the latest version of Mavericks - which I have. My next stop is the Genius Bar but willing to give this forum a shot first.