I am having issues printing a large .pdf with an HP Deskjet 6122 - it seems that each time I send the file to the printer, it works for a minute opening a connection, then stops all printer jobs. Each time I restart printing, the printer software works for a minute before shutting things down again. I do not have this problem with any other kind of file, and it shuts down whether I am printing from Adobe Acrobat or Preview. I am running 10.3.7.